CN114770022B - Auxiliary device for installing thermal pipeline - Google Patents
Auxiliary device for installing thermal pipeline Download PDFInfo
- Publication number
- CN114770022B CN114770022B CN202210539207.0A CN202210539207A CN114770022B CN 114770022 B CN114770022 B CN 114770022B CN 202210539207 A CN202210539207 A CN 202210539207A CN 114770022 B CN114770022 B CN 114770022B
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- Prior art keywords
- lifting mechanism
- block
- lifting
- base
- rod
- Prior art date
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- 230000007246 mechanism Effects 0.000 claims abstract description 83
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000009434 installation Methods 0.000 claims abstract description 11
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 230000003028 elevating effect Effects 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 abstract description 8
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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- 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
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G13/00—Roller-ways
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors
- B65G39/10—Arrangements of rollers
- B65G39/12—Arrangements of rollers mounted on framework
- B65G39/18—Arrangements of rollers mounted on framework for guiding loads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
- F16L1/09—Accessories therefor, e.g. anchors for bringing two tubular members closer to each other
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses an auxiliary device for installing a heating power pipeline, which comprises a base, a binding belt and a lifting mechanism, wherein the lower end of the base is provided with supporting legs, the upper end of the base is provided with a machine cabin, a hydraulic cylinder is arranged in the machine cabin, the upper end of the hydraulic cylinder is provided with a lifting mechanism which is in sliding fit with the inner wall of the machine cabin, the upper end of the lifting mechanism is matched with a lifting mechanism which is in horizontal sliding, the binding belt is connected with the lifting mechanism for fixing the heating power pipeline, two sides of the lifting mechanism are connected with conveying mechanisms which synchronously slide, and the conveying mechanisms are connected with the base. The device can replace a large lifting device, supports the two ends of the heating power pipeline, adjusts the height and the position and translates the axis direction to realize the butt joint of the pipelines, avoids occupying the lifting device for a long time, saves the cost, is simple and convenient to operate, and improves the butt joint efficiency of the pipelines; the device can adapt to different installation heights of pipelines, and is strong in universality and wide in application range.
Description
Technical Field
The invention relates to the technical field of thermal pipeline installation, in particular to an auxiliary device for thermal pipeline installation.
Background
The thermodynamic pipe network is also called a thermodynamic pipe, and starts from a boiler room, a direct-fired machine room, a heat supply center and the like, and is a heat supply pipe from a heat source to a thermodynamic inlet of a building. The plurality of heating pipes form a pipe network.
When the heating power pipeline is laid on the ground, the support column is required to be arranged to support the joint of the heating power pipeline, and the pipelines are fixed through welding, so that when the heating power pipeline is installed, adjacent pipelines are required to be butted, and the height and the position of the pipelines are required to be adjusted. At present, when a heating power pipeline is installed, the heating power pipeline is lifted through large lifting equipment and the position of the heating power pipeline is adjusted during installation, the pipeline is required to be suspended all the time in the butt joint and welding processes of the pipeline, so that the lifting equipment is continuously occupied, the lifting cost is increased, and the lifting efficiency of other pipelines is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the auxiliary device for installing the heating power pipeline, which can replace a large-scale lifting device, support the two ends of the heating power pipeline, adjust the height and the position and translate in the axial direction to realize the butt joint of the pipelines, avoid occupying the lifting device for a long time, save the cost, and have simple and convenient operation and improved the butt joint efficiency of the pipelines; the device can adapt to different installation heights of pipelines, and is strong in universality and wide in application range.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides a heating power pipeline installs auxiliary device, includes base, bandage and elevating system, the lower extreme of base is equipped with the supporting leg, and the upper end of base is equipped with the machine storehouse, be equipped with the pneumatic cylinder in the machine storehouse, the upper end of pneumatic cylinder be equipped with machine storehouse inner wall sliding fit's elevating system, elevating system's upper end cooperation has the horizontally sliding to lift the mechanism, and the bandage is connected with lifting the mechanism and is used for fixed heating power pipeline, lifting the both sides of mechanism and being connected with synchronous sliding conveying mechanism, conveying mechanism is connected with the base.
Preferably, the lifting mechanism comprises a lifting seat, sliding blocks are arranged on two sides of the lifting seat, guide rails matched with the sliding blocks are arranged on the inner wall of the cabin, and a top block connected with the hydraulic cylinder is arranged at the bottom of the lifting seat.
Preferably, the lifting seat is provided with a sliding groove, two ends of the lifting seat are provided with limiting plates, a second guide rod is connected between the two limiting plates, a screw rod connected with the limiting plates is arranged below the lifting seat, one end of the screw rod is provided with a handle, a yielding groove matched with the screw rod is formed in the side wall of the base, the lifting mechanism comprises a lifting block, the lower end of the lifting block is provided with a moving block, the moving block is provided with a second guide hole matched with the second guide rod, the lower end of the moving block is provided with a connecting block matched with the sliding groove, the lower end of the connecting block is provided with a synchronizing block, and the synchronizing block is provided with a driving hole matched with the screw rod in a threaded mode.
Preferably, the support block is long strip-shaped, the upper end of the support block is of a concave structure, and pull rings and draw hooks connected with the binding bands are respectively arranged at two ends of the support block.
Preferably, the conveying mechanism comprises a conveying roller and a supporting rod, a first guide hole is formed in the supporting rod, a first guide rod matched with the first guide hole is arranged at the upper end of the base, a rotating shaft of the conveying roller is connected with the supporting rod through a supporting rod, and an inclined stop block is arranged at the upper end of the supporting rod.
Preferably, the side wall of the supporting rod is vertically provided with a push rod, and the end part of the synchronizing block is provided with a push groove matched with the push rod.
Preferably, the two ends of the first guide rod are connected with the base through limiting blocks, and the conveying mechanism is located between the limiting blocks.
Preferably, the ejector block is a U-shaped mechanism, and the ejector block is sleeved on the outer side of the screw rod.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention can replace the hoisting large-scale equipment, support the two ends of the heating power pipeline, adjust the height and position and translate in the axial direction to realize the butt joint of the pipelines, avoid occupying the hoisting equipment for a long time, save the cost, and have simple and convenient operation and improved the butt joint efficiency of the pipelines; the device can adapt to different installation heights of pipelines, and is strong in universality and wide in application range.
2. According to the invention, the synchronous adjustment of the conveying mechanism and the lifting mechanism in the horizontal direction can be realized through the screw rod of the lifting mechanism, so that the conveying mechanism and the lifting mechanism always correspond to each other in position, the conveying mechanism can support and convey the pipeline after the lifting mechanism descends, the position adjusting speed is increased, the lifting mechanism and the conveyor can relatively move in the height direction, the switching between lifting and supporting conveying is realized, the use is convenient, and the lifting mechanism drives the lifting mechanism to realize synchronous lifting and convenient adjustment.
Drawings
FIG. 1 is a schematic perspective view of the present invention in use;
FIG. 2 is a front view of the present invention in use;
FIG. 3 is a front view of the present invention;
FIG. 4 is a left side view of the present invention;
FIG. 5 is a cross-sectional view A-A of FIG. 3;
FIG. 6 is a top view of the base;
FIG. 7 is a schematic view of the structure of the conveying mechanism;
FIG. 8 is a schematic view of the structure of the lifting mechanism;
FIG. 9 is a schematic diagram of a lifting mechanism;
Fig. 10 is a schematic structural diagram of a lifting mechanism.
In the figure: 1-a conveying mechanism; 101-a stop block; 102-conveying rollers; 103-supporting rods; 104-a supporting rod; 105-a first guide hole; 106-pushing rod; 2-a base; 201-supporting legs; 202-limiting blocks; 203-a first guide bar; 204, machine warehouse; 205—a rail; 206-a slider; 207-hydraulic cylinder; 208-yielding slots; 3-binding bands; 4-lifting mechanism; 401-supporting blocks; 402-pull ring; 403-drag hook; 404-moving blocks; 405-a second guide hole; 406-connecting blocks; 407-sync block; 408-pushing the groove; 409-a drive hole; 5-a lifting mechanism; 501-a second guide bar; 502-limiting plates; 503-lifting seat; 504-top block; 505-lead screw; 506-handle; 507-chute.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-6, an auxiliary device for installing a heating power pipeline comprises a base 2, a binding belt 3 and a lifting mechanism 5, wherein a supporting leg 201 is arranged at the lower end of the base 2, a machine cabin 204 is arranged at the upper end of the base 2, a hydraulic cylinder 207 is arranged in the machine cabin 204, the lifting mechanism 5 which is in sliding fit with the inner wall of the machine cabin 204 is arranged at the upper end of the hydraulic cylinder 207, a lifting mechanism 4 which is horizontally sliding is matched with the upper end of the lifting mechanism 5, the binding belt 3 is connected with the lifting mechanism 4 and used for fixing the heating power pipeline, two sides of the lifting mechanism 4 are connected with synchronous sliding conveying mechanisms 1, the conveying mechanism 1 is connected with the base 2, one end of the heating power pipeline can be lifted through the lifting mechanism 4, meanwhile, the lifting mechanism 4 can horizontally slide and adjust together with the conveying mechanism 1, the pipeline can be placed at the upper end of the conveying mechanism 1 by the lifting mechanism 4, the pipeline can be released along a pipeline axis, and the pipeline can be conveniently butted.
The concrete realization structure and effect are as follows:
As shown in fig. 9-10, the lifting mechanism 5 comprises a lifting seat 503, sliding blocks 206 are arranged on two sides of the lifting seat 503, guide rails 205 matched with the sliding blocks 206 are arranged on the inner wall of the machine cabin 204, a top block 504 connected with a hydraulic cylinder 207 is arranged at the bottom of the lifting seat 503, the lifting seat 503 is lifted through the hydraulic cylinder 207, and the lifting seat 503 is in sliding fit with the inner wall of the machine cabin 204, so that the lifting and supporting stability is ensured.
The lifting seat 503 is provided with a sliding groove 507, two ends of the lifting seat 503 are provided with limiting plates 502, a second guide rod 501 is connected between the two limiting plates 502, a screw rod 505 connected with the limiting plates 502 is arranged below the lifting seat 503, one end of the screw rod 505 is provided with a handle 506, the top block 504 is a U-shaped mechanism, and the top block 504 is sleeved on the outer side of the screw rod 505. The side wall of the base 2 is provided with a yielding groove 208 matched with the screw rod 505, as shown in fig. 8, the lifting mechanism 4 comprises a supporting block 401, the lower end of the supporting block 401 is provided with a moving block 404, the moving block 404 is provided with a second guide hole 405 matched with a second guide rod 501, the lower end of the moving block 404 is provided with a connecting block 406 matched with a chute 507, the lower end of the connecting block 406 is provided with a synchronizing block 407, and the synchronizing block 407 is provided with a driving hole 409 matched with the screw rod 505 in a threaded manner.
The lifting mechanism 4 can be driven to horizontally move through the handle 506 to adjust the lifting position by rotating the screw 505, meanwhile, the lifting seat 503 can drive the lifting mechanism 4 to synchronously lift, lifting of a pipeline is achieved, the matching structure between the lifting mechanism 4 and the lifting seat 503 is compact, and space is greatly saved.
Wherein, the support block 401 is rectangular, and the upper end of support block 401 is indent structure, prevents that the pipeline from rolling, and the both ends of support block 401 are equipped with pull ring 402 and drag hook 403 that are connected with bandage 3 respectively, can fix between pipeline and the support block 401, and stability and firm when guaranteeing to lift ensure the construction safety.
As shown in fig. 7, the conveying mechanism 1 includes a conveying roller 102 and a supporting rod 104, the conveying mechanism 1 is disposed on two sides of the lifting mechanism 4, a first guide hole 105 is disposed on the supporting rod 104, a first guide rod 203 matched with the first guide hole 105 is disposed at the upper end of the base 2, a rotating shaft of the conveying roller 102 is connected with the supporting rod 104 through a supporting rod 103, an inclined stop block 101 is disposed at the upper end of the supporting rod 104, and the stop block 101 can block two sides of a pipeline to prevent the pipeline from falling.
In order to enable the lifting mechanism 4 and the conveying mechanism 1 to synchronously move, a push rod 106 is vertically arranged on the side wall of the lifting rod 104, a push groove 408 matched with the push rod 106 is formed in the end portion of the synchronizing block 407, the synchronizing block 407 can drive the conveying mechanism 1 and the lifting mechanism 4 to synchronously move by horizontally pushing the push rod 106, and meanwhile the synchronizing block 407 can slide up and down along the push rod 106, so that the lifting mechanism 4 can relatively move in height between the conveying mechanisms 1, the conveying mechanisms 1 are guaranteed to always correspond to the positions of the lifting mechanism 4, pipelines can be supported and conveyed at any time, and adjustment is convenient.
The two ends of the first guide rod 203 are connected with the base 2 through the limiting blocks 202, the conveying mechanism 1 is located between the limiting blocks 202, and the limiting blocks 202 can limit the strokes of the conveying mechanism 1 and the lifting mechanism 4 to play a role in protection.
When the device is used, the device is arranged at two ends of a pipeline to support, the pipeline is placed on the supporting blocks 401, the height and the position of the pipeline are adjusted through the lifting mechanism 4, after the adjustment is finished, the lifting mechanism 4 is lowered to enable the pipeline to be positioned on the conveying roller 102, the pipeline is pushed to be in butt joint with the end part of the adjacent pipeline, the pipeline is fixed through the binding belt 3, then welding of the pipeline joint is carried out, after the welding is finished, the binding belt 3 is loosened, the lifting mechanism 4 is slowly lowered to enable the pipeline to be positioned on the bottom supporting column.
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. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The utility model provides a heating power pipeline installs auxiliary device, includes base, bandage and elevating system, its characterized in that: the lower end of the base is provided with supporting legs, the upper end of the base is provided with a machine cabin, a hydraulic cylinder is arranged in the machine cabin, the upper end of the hydraulic cylinder is provided with a lifting mechanism which is in sliding fit with the inner wall of the machine cabin, the upper end of the lifting mechanism is matched with a lifting mechanism which is in horizontal sliding, the binding belt is connected with the lifting mechanism for fixing a heating power pipeline, two sides of the lifting mechanism are connected with conveying mechanisms which are in synchronous sliding, and the conveying mechanisms are connected with the base;
the lifting mechanism comprises a lifting seat, sliding blocks are arranged on two sides of the lifting seat, guide rails matched with the sliding blocks are arranged on the inner wall of the cabin, and a top block connected with the hydraulic cylinder is arranged at the bottom of the lifting seat;
be equipped with the spout on the lifting seat, the both ends of lifting seat are equipped with the limiting plate, are connected with the second guide bar between two limiting plates, and the below of lifting seat is equipped with the lead screw of being connected with the limiting plate, the one end of lead screw is equipped with the handle, is equipped with the groove of stepping down with lead screw complex on the lateral wall of base, lifting mechanism includes the supporting shoe, the lower extreme of supporting shoe is equipped with the movable block, be equipped with on the movable block with second guide bar complex second guiding hole, the lower extreme of movable block is equipped with the connecting block with spout complex, the lower extreme of connecting block is equipped with the synchronizing block, be equipped with on the synchronizing block with lead screw complex drive hole.
2. A thermodynamic conduit installation aid as claimed in claim 1, wherein: the support block is long strip-shaped, the upper end of the support block is of a concave structure, and pull rings and draw hooks connected with the binding bands are respectively arranged at two ends of the support block.
3. A thermodynamic conduit installation aid as claimed in claim 1, wherein: the conveying mechanism comprises a conveying roller and a supporting rod, a first guide hole is formed in the supporting rod, a first guide rod matched with the first guide hole is arranged at the upper end of the base, a rotating shaft of the conveying roller is connected with the supporting rod through a supporting rod, and an inclined stop block is arranged at the upper end of the supporting rod.
4. A thermodynamic conduit installation aid as claimed in claim 3, wherein: the side wall of the supporting rod is vertically provided with a push rod, and the end part of the synchronizing block is provided with a push groove matched with the push rod.
5. A thermodynamic conduit installation aid as claimed in claim 3, wherein: the two ends of the first guide rod are connected with the base through limiting blocks, and the conveying mechanism is located between the limiting blocks.
6. A thermodynamic conduit installation aid as claimed in claim 2, wherein: the ejector block is a U-shaped mechanism and is sleeved on the outer side of the screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210539207.0A CN114770022B (en) | 2022-05-18 | 2022-05-18 | Auxiliary device for installing thermal pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210539207.0A CN114770022B (en) | 2022-05-18 | 2022-05-18 | Auxiliary device for installing thermal pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114770022A CN114770022A (en) | 2022-07-22 |
| CN114770022B true CN114770022B (en) | 2024-05-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210539207.0A Active CN114770022B (en) | 2022-05-18 | 2022-05-18 | Auxiliary device for installing thermal pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114770022B (en) |
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| CN106392444A (en) * | 2016-11-09 | 2017-02-15 | 国网山东省电力公司济南市长清区供电公司 | Fixed-distance conveying, rotating and clamping device for electric tower pipe |
| CN206348328U (en) * | 2017-01-03 | 2017-07-21 | 天津市同鑫泰钢管制造有限公司 | A kind of metal tube monitor station |
| CN207293262U (en) * | 2017-07-24 | 2018-05-01 | 广东科立工业技术股份有限公司 | A kind of lifting roller-conveying |
| CN109048192A (en) * | 2018-08-23 | 2018-12-21 | 合肥中亚传感器有限责任公司 | Lifting type operating platform is used in a kind of welding of electromagnetic flowmeter large-diameter catheter |
| CN212410256U (en) * | 2020-06-27 | 2021-01-26 | 山西新通成套设备有限公司 | Hydraulic press steel pipe lift centering device |
| CN213289262U (en) * | 2020-07-01 | 2021-05-28 | 航成（天津）科技有限公司 | Lifting screw force balance weight device of positioner |
| KR102192444B1 (en) * | 2020-08-05 | 2020-12-16 | (주) 국제플랜트 | Open chuck clamp welder |
| CN111761289A (en) * | 2020-08-17 | 2020-10-13 | 陈红 | Clamping device for welding steel pipe |
| CN112207503A (en) * | 2020-09-07 | 2021-01-12 | 宜昌江峡船用机械有限责任公司 | Accurate adjustment butt joint device and method for large pressure container |
| KR20220049783A (en) * | 2020-10-15 | 2022-04-22 | 한국조선해양 주식회사 | Batch welding apparatus for make up cylindrical tank |
| CN113385829A (en) * | 2021-04-30 | 2021-09-14 | 河南勤工机器人有限公司 | Rotating device for laser cutting |
| CN113369759A (en) * | 2021-06-30 | 2021-09-10 | 王晓光 | Natural gas line welding equipment for municipal administration |
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