CN216844639U - Low pressure feed water heater support structure of throat of adjustable elevation - Google Patents
Low pressure feed water heater support structure of throat of adjustable elevation Download PDFInfo
- Publication number
- CN216844639U CN216844639U CN202121353665.2U CN202121353665U CN216844639U CN 216844639 U CN216844639 U CN 216844639U CN 202121353665 U CN202121353665 U CN 202121353665U CN 216844639 U CN216844639 U CN 216844639U
- Authority
- CN
- China
- Prior art keywords
- throat
- support
- low
- pressure heater
- adjusting
- 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.)
- Active
Links
Images
Landscapes
- Foundations (AREA)
Abstract
A throat low-pressure heater support structure capable of adjusting elevation relates to the technical field of heat exchangers. The problem of current mounting means probably because the actual elevation of throat low pressure heater is inconsistent with the design elevation because of reasons such as manufacturing dimension deviation, tolerance accumulation, installation error, condenser welding seam welding shrink in the actual installation, when the difference in height is great, pipeline butt weld department and takeover and low pressure heater barrel junction will produce great stress, cause the hidden danger to the safe operation of equipment is solved in order to solve. The actual elevation that makes the low interpolation of throat satisfy the design value through the quantity of increase and decrease adjustment backing plate or adjustment cushion to guaranteed that the low effect that is in free expansion of throat can the free slip of sliding end, can guarantee again simultaneously that the low elevation that adds satisfies the design value, reduced the stress of on-the-spot pipeline to mouthful department and takeover and heater barrel junction, guaranteed the safe and stable operation of equipment. The utility model is suitable for a low pressure feed water heater field of throat.
Description
Technical Field
The utility model relates to a heat exchanger technical field, concretely relates to low pressure feed water heater support structure of throat of adjustable elevation.
Background
The last two-stage low-pressure heater is usually arranged at the throat of the condenser, at present, the throat low-pressure heater manufactured in China is usually welded with a support positioned at the low feeding head part and directly seated on the support positioned at the low feeding tail part without being welded with the support so as to meet the free expansion of the low feeding throat part. In the actual installation process, the actual elevation of the low-pressure heater at the throat part is not consistent with the designed elevation due to the manufacturing size deviation, tolerance accumulation, installation error, transportation and storage deformation, welding contraction of a welding seam of the condenser and the like, and the low-pressure heater is directly seated on a supporting piece of the condenser, so that no adjusting space exists. And the height difference exists when each low-pressure joint pipe is connected with an external pipeline, so that the pipeline installation is difficult. When the height difference is large, large stress is generated at the butt welding seam of the pipeline and the joint of the connecting pipe and the low-pressure heater cylinder, and hidden danger is caused to the safe operation of equipment.
In conclusion, in the existing installation method, the actual elevation of the low-pressure heater at the throat part is not consistent with the designed elevation due to the manufacturing size deviation, tolerance accumulation, installation error, welding contraction of the welding seam of the condenser and the like in the actual installation process, and when the height difference is large, large stress is generated at the butt welding seam of the pipeline and the joint of the connecting pipe and the low-pressure heater cylinder body, so that the potential hazard is caused to the safe operation of equipment.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve current mounting means probably because manufacturing size deviation in the actual installation, the tolerance accumulation, installation error, reasons such as condenser welding seam welding shrink lead to the actual elevation of low pressure feed water heater of throat inconsistent with the design elevation, when the difference in height is great, the pipeline will produce great stress to the department of mouth welding seam and takeover and low pressure feed water heater barrel junction, cause the problem of hidden danger to the safe operation of equipment, and provide a low pressure feed water heater support structure of throat of adjustable elevation.
The utility model relates to a throat low-pressure heater support structure with adjustable elevation, which comprises an H-shaped steel seat, a fixed support and a sliding support; a fixed support is arranged at one end of the lower surface of the throat low-pressure heater, the bottom end of the fixed support is fixed with one end of the upper surface of the H-shaped steel seat, a sliding support is arranged at the other end of the lower surface of the throat low-pressure heater, and the bottom surface of the sliding support is fixed with the other end of the upper surface of the H-shaped steel seat;
furthermore, the fixed support comprises a first saddle support and an adjusting base plate, the top end of the first saddle support is fixedly connected with one end of the lower surface of the throat low-pressure heater, n layers of adjusting base plates are arranged at the bottom of the first saddle support, n is a positive integer, and the lower surface of the adjusting base plate is fixedly connected with one end of the upper surface of the H-shaped steel seat;
furthermore, every two adjusting backing plates are fixed by welding;
furthermore, the lower surface of the adjusting backing plate is welded and fixed with one end of the upper surface of the H-shaped steel seat;
furthermore, the bottom of the first saddle type support is welded and fixed with the upper surface of the adjusting base plate;
furthermore, the number n of the adjusting backing plates is not less than 1 and not more than 50;
furthermore, the sliding support comprises a second saddle type support, an adjusting cushion block, a bolt, a washer and a nut;
the top of the second saddle type support is fixedly connected with the other end of the lower surface of the throat low-pressure heater, m U-shaped through holes are formed in the bottom plate of the second saddle type support along the long edge direction, m is a positive integer, k layers of adjusting cushion blocks are arranged on the lower surface of the bottom plate of the second saddle type support, k is a positive integer, r through holes are formed in the adjusting cushion blocks along the long edge direction, r is a positive integer, a plurality of through holes are formed in the upper surface of the other end of the H-shaped steel base along the axis direction, a bolt is arranged in each through hole in the upper surface of the other end of the H-shaped steel base, and the thread section of each bolt sequentially penetrates through the through holes in the adjusting cushion blocks, the through holes in the bottom plate of the second saddle type support and a gasket and then is in threaded connection with a nut;
furthermore, the number m of U-shaped through holes of the bottom plate of the second saddle support is equal to the number r of through holes in the adjusting cushion block, wherein the r is m; the number m of the U-shaped through holes of the bottom plate of the second saddle type support is more than or equal to 1 and less than or equal to 10;
furthermore, k is more than or equal to 1 and less than or equal to 50 according to the number k of the adjusting cushion blocks;
further, the gap between the nut and the washer is 0.2 mm;
furthermore, the lower surface of the adjusting cushion block is welded and fixed with the upper surface of the other end of the H-shaped steel seat;
furthermore, when the throat-shaped low-pressure heater is used, a design distance of 10mm is reserved between the saddle-type supports at two ends and the H-shaped steel seat of the throat-shaped low-pressure heater, and a plurality of adjusting base plates with the thickness of 2mm are installed between the saddle-type supports and the H-shaped steel on site. An adjusting base plate of the fixed support is respectively welded with the first saddle type support and the H-shaped steel base; the adjusting cushion block of the sliding support is not welded with the saddle type II support, and is welded with the H-shaped steel base. The H-shaped steel seat at the bottom end of the sliding support, the adjusting cushion block and the second saddle type support base plate are provided with bolt holes, and a gap of 0.2mm is reserved between the nut and the gasket, so that the saddle and the adjusting cushion block can freely slide, and the throat part can freely expand. The actual elevation that makes the low interpolation of throat satisfy the design value through the quantity of increase and decrease adjustment backing plate during field installation to guaranteed that the low effect that is in free expansion of throat can slide by the sliding end freely, can guarantee again simultaneously that the low elevation that adds satisfies the design value, reduced the stress of on-the-spot pipeline to mouthful department and takeover and heater barrel junction, guaranteed the safe and stable operation of equipment.
Compared with the prior art, the utility model following beneficial effect has:
the utility model overcomes prior art's shortcoming, the quantity through increase and decrease adjustment backing plate or adjustment cushion makes the low actual elevation that adds of throat satisfy the design value to guaranteed that the low effect that is in free expansion of throat slide end can freely slide, can guarantee again simultaneously to hang down to add the elevation and satisfy the design value, reduced the on-the-spot pipeline to the stress of department and takeover and heater barrel junction, guaranteed the safety and stability operation of equipment.
Drawings
FIG. 1 is an assembly view of a throat low pressure heater support structure with adjustable elevation according to the present invention in a use state;
fig. 2 is a side view of a fixed support in the support structure of the throat low-pressure heater with adjustable elevation according to the present invention;
fig. 3 is a side view of a sliding support in a support structure of a throat low-pressure heater with adjustable elevation according to the present invention;
fig. 4 is a partial cross-sectional view of a sliding support in a support structure of a throat low-pressure heater with adjustable elevation according to the present invention;
FIG. 5 is a schematic view in the direction of FIG. 3A;
fig. 6 is a top view of an adjusting pad block of a sliding support in a support structure of a throat low-pressure heater with adjustable elevation according to the present invention;
fig. 7 is a top view of a saddle type support of a sliding support in a throat low pressure heater support structure with adjustable elevation of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, 2 and 3, and the elevation-adjustable throat low-pressure heater support structure of the embodiment comprises an H-shaped steel seat 1, a fixed support 2 and a sliding support 3; a fixed support 2 is arranged at one end of the lower surface of the throat low-pressure heater 4, the bottom end of the fixed support 2 is fixed with one end of the upper surface of the H-shaped steel seat 1, a sliding support 3 is arranged at the other end of the lower surface of the throat low-pressure heater 4, and the bottom surface of the sliding support 3 is fixed with the other end of the upper surface of the H-shaped steel seat 1;
in the specific embodiment, when the throat-shaped low-pressure heater is used, 10mm of design distance is reserved between the saddle-type supports at two ends and the H-shaped steel seat 1 of the throat-shaped low-pressure heater, and a plurality of adjusting backing plates 2-2 with the thickness of 2mm are installed between the saddle-type supports and the H-shaped steel on site. An adjusting base plate 2-2 of the fixed support 2 is respectively welded with a saddle type support 2-1 and an H-shaped steel seat 1; an adjusting cushion block 3-2 of the sliding support 3 is not welded with a saddle type II support 3-1, and is welded with an H-shaped steel seat 1. A bolt hole is formed in a base plate of an H-shaped steel seat 1 at the bottom end of the sliding support, an adjusting cushion block 3-2 and a saddle type support 3-1, and a gap of 0.2mm is reserved between a nut 3-5 and a gasket 3-4, so that the saddle and the adjusting cushion block 3-2 can slide freely, and the throat part can expand freely due to low pressure. When the device is installed on site, the actual elevation of the low throat part can meet the design value by increasing or decreasing the number of the adjusting base plates 2-2, so that the sliding end can freely slide under the action of free expansion of the low throat part, the low elevation can meet the design value, the stress of the opposite port of a site pipeline and the joint of a connecting pipe and a heater cylinder body is reduced, and the safe and stable operation of the device is ensured.
The second embodiment is as follows: the embodiment is described with reference to fig. 2, and the embodiment is a further limitation to the support structure described in the first embodiment, and the support structure for the low-pressure throat heater with adjustable elevation described in the first embodiment includes a first saddle support 2-1 and an adjusting shim plate 2-2, wherein the top end of the first saddle support 2-1 is fixedly connected with one end of the lower surface of the low-pressure throat heater 4, n layers of adjusting shim plates 2-2 are arranged at the bottom of the first saddle support 2-1, n is a positive integer, and the lower surface of the adjusting shim plate 2-2 is fixedly connected with one end of the upper surface of the H-shaped steel base 1.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1 and 2, and the present embodiment is a further limitation to the support structure of the second embodiment, and the support structure of the throat low pressure heater with adjustable elevation of the present embodiment is a support structure of the throat low pressure heater with adjustable elevation, and each two adjustable backing plates 2-2 are fixed by welding;
in the specific embodiment, every two adjusting backing plates 2-2 are fixed by welding, so that the stability of the device is improved.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 1 and 2, and the present embodiment is a support structure for a low pressure heater for throat part with adjustable elevation, which is described in the second embodiment, wherein the lower surface of the adjusting shim plate 2-2 is welded and fixed to one end of the upper surface of the H-shaped steel base 1.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1 and 2, and the present embodiment is a further limitation of the support structure of the second embodiment, and in the support structure of the low pressure heater for throat with adjustable elevation of the present embodiment, the bottom of the first saddle support 2-1 is welded and fixed to the upper surface of the adjusting shim plate 2-2.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 and 2, and the present embodiment is a further limitation to the support structure of the second embodiment, and the number n of the adjusting shim plates 2-2, n being greater than or equal to 1 and less than or equal to 50, and the thickness of the adjusting shim plates 2-2 being 2mm in the support structure of the low-pressure heater for throat with adjustable elevation in the present embodiment;
in the specific embodiment, the number n of the adjusting base plates 2-2 is adopted, n is more than or equal to 1 and less than or equal to 50, the thickness of the adjusting base plates 2-2 is 2mm, and the actual elevation of the low throat part can meet the design value by increasing or decreasing the number of the adjusting base plates 2-2 during field installation, so that the sliding end of the low throat part can freely slide under the action of free expansion, the low elevation can meet the design value, the stress of the opposite opening of a field pipeline and the joint of a connecting pipe and a heater cylinder body can be reduced, and the safe and stable operation of equipment can be ensured.
The seventh concrete implementation mode: the present embodiment is described with reference to fig. 3 to 7, and the present embodiment is a further limitation of the support structure of the first embodiment, and the support structure of the low pressure heater for throat with adjustable elevation of the present embodiment, wherein the sliding support 3 includes a saddle type two support 3-1, an adjusting pad 3-2, a bolt 3-3, a washer 3-4 and a nut 3-5;
the top of the second saddle type support 3-1 is fixedly connected with the other end of the lower surface of the throat low-pressure heater 4, m U-shaped through holes are formed in the bottom plate of the second saddle type support 3-1 along the long edge direction, m is a positive integer, k layers of adjusting cushion blocks 3-2 are arranged on the lower surface of the bottom plate of the second saddle type support 3-1, k is a positive integer, r through holes are formed in the adjusting cushion blocks 3-2 along the long edge direction, r is a positive integer, a plurality of through holes are formed in the upper surface of the other end of the H-shaped steel base 1 along the axis direction, a bolt 3-3 is arranged in each through hole in the upper surface of the other end of the H-shaped steel base 1, and thread sections of the bolts 3-3 sequentially penetrate through holes in the adjusting cushion blocks 3-2, a through hole on the bottom plate of the second saddle type support 3-1 and behind a washer 3-4 are in threaded connection with a nut 3-5;
this embodiment makes the low actual elevation that adds of throat satisfy the design value through the quantity that increases and decreases the adjustment cushion to guaranteed that the low effect that is in free expansion of throat can the free slip end, can guarantee again simultaneously that the low elevation that adds satisfies the design value, reduced the stress of on-the-spot pipeline to mouthful department and takeover and heater barrel junction, guarantee the safe and stable operation of equipment.
The specific implementation mode is eight: the present embodiment is described with reference to fig. 3 to 7, and the present embodiment is a further limitation to the support structure of the seventh embodiment, in the support structure of the throat low pressure heater with adjustable elevation of the present embodiment, the number m of U-shaped through holes of the bottom plate of the saddle support No. two 3-1 is equal to the number r of through holes of the adjusting pad 3-2, and r is equal to m; the number m of the U-shaped through holes of the bottom plate of the second saddle type support 3-1 is more than or equal to 1 and less than or equal to 10.
The specific implementation method nine: the present embodiment is described with reference to fig. 3 to 7, and the present embodiment is a further limitation to the support structure of the seventh embodiment, and in the support structure of the low pressure heater for throat with adjustable elevation of the present embodiment, the number k of the adjusting spacers 3-2 is 1 ≦ k ≦ 50, and the thickness of the adjusting spacers 3-2 is 2 mm.
The detailed implementation mode is ten: the present embodiment is described with reference to fig. 3 to 7, and the present embodiment further defines the seat structure of the seventh embodiment, and the seat structure of the throat low pressure heater with adjustable elevation of the present embodiment has a gap of 0.2mm between the nut 3-5 and the washer 3-4; and the lower surface of the adjusting cushion block 3-2 is welded and fixed with the upper surface of the other end of the H-shaped steel seat 1.
Principle of operation
When the throat-mounted adjusting cushion plate is used, 10mm of design distance is reserved between the saddle-type supports at two ends and the H-shaped steel seat 1 of the throat-mounted low-pressure heater, and a plurality of adjusting cushion plates 2-2 with the thickness of 2mm are installed between the saddle-type supports and the H-shaped steel on site. An adjusting base plate 2-2 of the fixed support 2 is respectively welded with a saddle type support 2-1 and an H-shaped steel seat 1; an adjusting cushion block 3-2 of the sliding support 3 is not welded with a saddle type II support 3-1, and is welded with an H-shaped steel seat 1. A bolt hole is formed in a base plate of an H-shaped steel seat 1, an adjusting cushion block 3-2 and a saddle type II support 3-1 at the bottom end of a sliding support, a gap of 0.2mm is reserved between a nut 3-5 and a washer 3-4, the saddle and the adjusting cushion block 3-2 can slide freely, and therefore the lower part of the throat can expand freely. When the device is installed on site, the actual elevation of the low throat part can meet the design value by increasing or decreasing the number of the adjusting base plates 2-2, so that the sliding end of the low throat part can slide freely under the action of free expansion, the low elevation can meet the design value, the stress of the opposite port of a site pipeline and the joint of the connecting pipe and the heater cylinder is reduced, and the safe and stable operation of the device is ensured.
Claims (10)
1. The utility model provides an adjustable elevation's low pressure feed water heater support structure of throat which characterized in that: the device comprises an H-shaped steel seat (1), a fixed support (2) and a sliding support (3); one end of the lower surface of the throat low-pressure heater (4) is provided with a fixed support (2), the bottom end of the fixed support (2) is fixed with one end of the upper surface of the H-shaped steel seat (1), the other end of the lower surface of the throat low-pressure heater (4) is provided with a sliding support (3), and the bottom surface of the sliding support (3) is fixed with the other end of the upper surface of the H-shaped steel seat (1).
2. The adjustable elevation throat low pressure heater support structure of claim 1, wherein: the fixed support (2) comprises a first saddle type support (2-1) and an adjusting base plate (2-2), the top end of the first saddle type support (2-1) is fixedly connected with one end of the lower surface of the throat low-pressure heater (4), n layers of adjusting base plates (2-2) are arranged at the bottom of the first saddle type support (2-1), n is a positive integer, and the lower surface of the adjusting base plate (2-2) is fixedly connected with one end of the upper surface of the H-shaped steel seat (1).
3. The adjustable elevation throat low pressure heater support structure of claim 2, wherein: and every two adjusting backing plates (2-2) are fixed by welding.
4. The adjustable elevation throat low pressure heater support structure of claim 2, wherein: the lower surface of the adjusting backing plate (2-2) is welded and fixed with one end of the upper surface of the H-shaped steel seat (1).
5. The adjustable elevation throat low pressure heater support structure of claim 2, wherein: the bottom of the first saddle type support (2-1) is welded and fixed with the upper surface of the adjusting backing plate (2-2).
6. The adjustable level throat low pressure heater stand structure according to claim 2, wherein: the number n of the adjusting backing plates (2-2) is more than or equal to 1 and less than or equal to 50, and the thickness of the adjusting backing plates (2-2) is 2 mm.
7. The adjustable elevation throat low pressure heater support structure of claim 1, wherein: the sliding support (3) comprises a saddle type II support (3-1), an adjusting cushion block (3-2), a bolt (3-3), a washer (3-4) and a nut (3-5);
the top of the second saddle type support (3-1) is fixedly connected with the other end of the lower surface of the throat low-pressure heater (4), m U-shaped through holes are formed in the bottom plate of the second saddle type support (3-1) along the long edge direction, m is a positive integer, k layers of adjusting cushion blocks (3-2) are arranged on the lower surface of the bottom plate of the second saddle type support (3-1), k is a positive integer, r through holes are formed in the adjusting cushion blocks (3-2) along the long edge direction, r is a positive integer, a plurality of through holes are formed in the upper surface of the other end of the H-shaped steel seat (1) along the axial direction, a bolt (3-3) is arranged inside each through hole in the upper surface of the other end of the H-shaped steel seat (1), the thread section of the bolt (3-3) sequentially penetrates through holes in the adjusting cushion blocks (3-2), through holes in the bottom plate of the second saddle type support (3-1) and gaskets (3-4), is in threaded connection with the nut (3-5).
8. The adjustable level throat low pressure heater support structure according to claim 7, wherein: the number m of U-shaped through holes of the bottom plate of the second saddle support (3-1) is equal to the number r of through holes in the adjusting cushion block (3-2), and r is equal to m; the number m of the U-shaped through holes of the bottom plate of the second saddle type support (3-1) is more than or equal to 1 and less than or equal to 10.
9. The adjustable elevation throat low pressure heater support structure of claim 7, wherein: the number k of the adjusting cushion blocks (3-2) is more than or equal to 1 and less than or equal to 50, and the thickness of the adjusting cushion blocks (3-2) is 2 mm.
10. The adjustable elevation throat low pressure heater support structure of claim 7, wherein: the clearance between the nut (3-5) and the washer (3-4) is 0.2 mm; the lower surface of the adjusting cushion block (3-2) is welded and fixed with the upper surface of the other end of the H-shaped steel seat (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121353665.2U CN216844639U (en) | 2021-06-17 | 2021-06-17 | Low pressure feed water heater support structure of throat of adjustable elevation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121353665.2U CN216844639U (en) | 2021-06-17 | 2021-06-17 | Low pressure feed water heater support structure of throat of adjustable elevation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216844639U true CN216844639U (en) | 2022-06-28 |
Family
ID=82082390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121353665.2U Active CN216844639U (en) | 2021-06-17 | 2021-06-17 | Low pressure feed water heater support structure of throat of adjustable elevation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216844639U (en) |
-
2021
- 2021-06-17 CN CN202121353665.2U patent/CN216844639U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202037426U (en) | Auxiliary anti-vibration strip assembly tooling for steam generator tube bundle | |
| CN216844639U (en) | Low pressure feed water heater support structure of throat of adjustable elevation | |
| CN201354900Y (en) | Pipe joint | |
| CN210770664U (en) | Novel steel bushing steel frame hollow pipe support | |
| CN210510709U (en) | Novel metal corrugated pipe compensator for high-voltage combined electrical apparatus | |
| CN205643025U (en) | High pressure float head heat -exchanger shell side pressure testing device | |
| CN201016615Y (en) | Fixed tube sheet type prestressed heat exchanger | |
| CN110560829A (en) | Novel welding tool | |
| CN211396851U (en) | Cement bin support frame mounting structure | |
| CN210566785U (en) | High-precision welding and drawing pipe stable to install | |
| CN211203218U (en) | 700 ℃ ultra-high temperature flange | |
| CN217153271U (en) | A supporting structure for supporting FPSO major diameter FRP pipe way | |
| CN210865832U (en) | Connection supporting structure for oil inlet and outlet pipes of water cooler of power transformer | |
| CN114571151B (en) | Construction method for centralized installation of construction platform of small-caliber pipelines of waste heat furnace | |
| CN221743515U (en) | Safety fixing pipe bracket for heating pipeline | |
| CN220792297U (en) | Primary pipe support adjusting structure of large-diameter marine oil and gas pipeline | |
| CN210714908U (en) | Hydraulic generator elastic oil tank cutting ferrule connection structure | |
| CN220881229U (en) | Multipurpose anti-deformation clamp for pipe fitting welding | |
| CN107084887B (en) | Detachable tube bundle tube side reliability pressure testing device | |
| CN215238979U (en) | Fixing device for steel pipe welding | |
| CN214147841U (en) | Improved high-pressure boiler tube panel fixing device | |
| CN221927719U (en) | Tensioning and positioning device for Hua type box transformer radiator | |
| CN214081198U (en) | Flange connection type water meter valve pipe fitting dismounting expander | |
| CN216521698U (en) | Connecting structure of horizontal rigid beam and membrane water-cooled wall of garbage incineration boiler | |
| CN219443983U (en) | Auxiliary device for welding radiating fin of transformer oil tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |