CN114001229B - Heat tracing pipe convenient for intermittent replacement and installation method thereof - Google Patents
Heat tracing pipe convenient for intermittent replacement and installation method thereof Download PDFInfo
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- CN114001229B CN114001229B CN202111275160.3A CN202111275160A CN114001229B CN 114001229 B CN114001229 B CN 114001229B CN 202111275160 A CN202111275160 A CN 202111275160A CN 114001229 B CN114001229 B CN 114001229B
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- 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
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Mechanical Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a heat tracing pipe convenient for intermittent replacement and an installation method thereof, and the heat tracing pipe comprises a main pipe, a quick-release mechanism, a positioning mechanism and a limiting mechanism, wherein the quick-release mechanism convenient for independent disassembly is installed on the left side and the right side of the main pipe, fixed inner rings are installed inside the left end and the right end of the main pipe, the positioning mechanism convenient for corresponding adjustment according to the torsion angle of a built-in pipeline is installed inside the fixed inner rings, a connecting rod is installed in the center of the positioning mechanism, and the limiting mechanisms for effectively clamping the end head of the built-in pipeline are installed inside the front side and the back side of the connecting rod. The heat tracing pipe is convenient to detach and replace independently through the quick detaching mechanism, the position adjusting mechanism and the limiting mechanism are convenient to effectively clamp the inner pipeline and adjust the butted corner size as required, and the using effect of the heat tracing pipe is improved.
Description
Technical Field
The invention relates to the technical field of heat tracing pipes, in particular to a heat tracing pipe convenient for intermittent replacement and an installation method thereof.
Background
The heat tracing pipe is called as a heat tracing pipe for short. The heat tracing objects are flue gas, pressure guide pipes, regulating valves, instruments and heat insulation boxes directly mounted on process pipelines or process equipment, so that effective guarantee is provided for the temperature of the line, and the line can still normally convey and operate in a low-temperature environment.
The existing heat tracing pipe has the following defects: 1. the existing heat tracing pipe is an integral body, and when the heat tracing pipe is damaged or fails, the heat tracing pipe is usually only a single section part, but needs to be integrally replaced, and the rest parts are all wasted, so that the cost is increased, and the using effect is reduced. 2. The limiting effect of the inner pipe inside the conventional heat tracing pipe is poor, so that the internal pipeline is applied by external pressure in the using process, the pipeline is relatively poor in deviation inside, the pipeline is easily twisted and broken, and the heat tracing pipe is damaged.
Disclosure of Invention
The invention mainly aims to provide a heat tracing pipe convenient for intermittent replacement and an installation method thereof, which can effectively solve the problems in the background art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a heat tracing pipe convenient for intermittent replacement comprises a main pipe, a quick-release mechanism, a position adjusting mechanism and a limiting mechanism, wherein the quick-release mechanism convenient for independent disassembly is arranged on the left side and the right side of the main pipe;
the quick-release mechanism comprises a tube seat, a tube inserting head and a first bolt, the tube seat is welded outside the left end of the main tube, an inserting groove is formed in the left end of the tube seat, the tube inserting head is welded on the outer wall of the right end of the main tube, first screw grooves are formed in the centers of the front side and the rear side of the tube seat, second screw grooves are formed in the positions, corresponding to the first screw grooves, of the front side and the rear side of the tube inserting head, and the first bolt is meshed and installed in the first screw grooves;
the positioning mechanism comprises an inner groove, a limiting block and a second bolt, the inner groove is formed in the edge of the fixed inner ring, the limiting block is embedded in the inner groove, a third spiral groove is formed in the outer end of the limiting block in the left-right direction, a fourth spiral groove is formed in the outer end of the inner groove in the left-right direction, and the second bolt is installed in the third spiral groove and the fourth spiral groove in a meshed mode;
stop gear includes spacing groove, splint and spring, the spacing groove is seted up inside about the connecting rod left and right sides, splint are installed in the spacing inslot portion, the spring mounting is in the spacing inslot in the vertical outside of splint.
Preferably, the size of the cannula head and the size of the slot are matched with each other.
Preferably, the limiting block is arc-shaped and is embedded with the circular inner groove.
Preferably, the first bolt outer wall thread is meshed with the first screw groove inner wall thread and the second screw groove inner wall thread.
Preferably, the second bolt outer wall thread is meshed with the third thread groove and the fourth thread groove inner wall thread.
Preferably, the inner end surface of the clamping plate is serrated.
Preferably, the limiting groove inclines towards the center of the vertical outer end.
A method for installing a heat tracing pipe convenient for intermittent replacement comprises the following steps:
the method comprises the following steps: firstly, a spanner is used for rotating first bolts at the left side and the right side of a main pipe of a section to be replaced in a meshing manner, so that the first bolts are taken out from the first screw grooves and the second screw grooves in a rotating manner, the insertion pipe head at the right end of the main pipe at the left side of the damaged main pipe is pulled leftwards to be separated from the insertion groove at the left side of the damaged main pipe, and the insertion pipe head at the right end of the damaged main pipe is separated from the insertion groove at the main pipe at the right end of the damaged main pipe;
step two: fusing the wiring ends of the inner pipelines exposed at the two ends of the damaged main pipe by using a welding gun, and then independently detaching the damaged main pipe;
step three: manually and forcefully pulling the clamping plates to enable the clamping plates to slide towards the outer ends in the limiting grooves to extrude the springs, wherein the springs are extruded and contracted to change kinetic energy into elastic potential energy, the replaced new inner pipelines are respectively inserted into the main pipe from the clamping plate gaps, so that the two ends of the inner pipelines are positioned between the clamping plates at the two ends of the main pipe, the tension on the clamping plates is loosened, the springs convert the elastic potential energy into the kinetic energy, and the serrated clamping plates firmly clamp the inner pipelines with different sizes;
step four: manually twisting the connecting rod to drive the circular-arc limiting blocks with the upper side and the lower side embedded in the inner grooves to be attached and rotated in the inner grooves, so that the rotating size of the connecting rod is adjusted according to the requirement of the wiring torsion angle of the inner pipeline, after adjustment, a third screw groove at the outer end of the limiting block is aligned with a fourth screw groove arranged in the outer end of the fixed inner ring at the corresponding position after adjustment, and a second bolt is arranged in the third screw groove and the fourth screw groove in a meshing and rotating mode by using a screwdriver, so that the connecting rod can be fixed, and the torsion position of the clamped inner pipeline can be fixed;
step five: carry out the butt fusion with the interior pipeline of being responsible for inside of being responsible for both sides through the welding respectively with being changed in interior pipeline both ends, owing to be responsible for itself for the toughness material, can make and be responsible for the bending when being responsible for left side slot with inserting the intubate head and being changed to insert the intubate head of both sides respectively in the slot, make first spiral shell groove and second spiral shell groove align, install first bolt engagement inside first spiral shell groove and second spiral shell groove, can accomplish the independent installation of changing the heat tracing pipe again.
Compared with the prior art, the invention has the following beneficial effects: 1. when the heat tracing pipe is locally damaged, after the section of the pipeline which breaks down is confirmed through an external flaw detector, the first bolts on the left side and the right side of the section are turned forwards through a wrench to rotate, so that the first bolts can be taken down through meshing rotation, the left cannula head can be pulled out from the left side of the tube seat of the main tube, meanwhile, the cannula head on the right side of the main tube which is damaged is pulled out from the right side of the tube seat of the main tube, the welding points on the left side and the right side of the internal pipeline of the main tube are fused, the main tube of the pipeline which breaks down can be independently detached, the rest normal pipelines are reserved, the waste loss of the pipeline is avoided, the cost is reduced, and the using effect of the heat tracing pipe is improved.
2. When the pipeline after being changed is installed, the two ends of the internal pipeline which is installed by the upper clamping plate and the lower clamping plate on the two sides are firmly clamped through elastic potential energy, the pipeline is inserted into the main pipe, the circular-arc limiting blocks and the circular-ring-shaped inner grooves are mutually embedded, the rotating direction of the connecting rod is driven, the built-in angle of the pipeline which is clamped by the clamping plates is adjusted as required, and therefore subsequent welding is facilitated.
Drawings
FIG. 1 is a schematic perspective view of a heat tracing pipe convenient for intermittent replacement according to the present invention.
FIG. 2 is a schematic view of a partial side view of a cross-sectional structure of a position adjusting mechanism of a heat tracing pipe convenient for intermittent replacement according to the present invention.
FIG. 3 is a partially enlarged structural view of a heat trace pipe A in FIG. 1 for facilitating intermittent replacement according to the present invention.
FIG. 4 is a partial perspective view of the position adjusting mechanism of the heat tracing pipe convenient for intermittent replacement according to the present invention.
FIG. 5 is a schematic view of the front cross-sectional structure of a heat tracing pipe limiting mechanism facilitating intermittent replacement according to the present invention.
In the figure: 1. a main pipe; 201. a tube holder; 202. a cannula head; 203. a first screw groove; 204. a second screw groove; 205. a first bolt; 206. inserting slots; 3. fixing the inner ring; 401. an inner tank; 402. a limiting block; 403. a third screw groove; 404. a fourth screw groove; 405. a second bolt; 5. a connecting rod; 601. a limiting groove; 602. a splint; 603. a spring.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-5, a heat tracing pipe convenient for intermittent replacement comprises a main pipe 1, a quick-release mechanism, a positioning mechanism and a limiting mechanism, wherein the quick-release mechanism convenient for independent disassembly is installed on the left side and the right side of the main pipe 1, fixed inner rings 3 are installed inside the left end and the right end of the main pipe 1, the positioning mechanism convenient for corresponding adjustment according to the torsion angle of a built-in pipeline is installed inside the fixed inner rings 3, a connecting rod 5 is installed in the center of the positioning mechanism, and the limiting mechanisms for effectively clamping the end heads of the built-in pipeline are installed inside the front side and the back side of the connecting rod 5;
the quick release mechanism comprises a tube seat 201, a tube inserting head 202 and a first bolt 205, the tube seat 201 is welded outside the left end of the main tube 1, an inserting groove 206 is formed in the left end of the tube seat 201, the tube inserting head 202 is welded on the outer wall of the right end of the main tube 1, a first spiral groove 203 is formed in the center of the front side and the rear side of the tube seat 201, a second spiral groove 204 is formed in the position, corresponding to the first spiral groove 203, of the front side and the rear side of the tube inserting head 202, and the first bolt 205 is meshed and installed in the first spiral groove 203;
the positioning mechanism comprises an inner groove 401, a limiting block 402 and a second bolt 405, the inner groove 401 is arranged inside the edge of the fixed inner ring 3, the limiting block 402 is embedded inside the inner groove 401, a third screw groove 403 is formed in the outer end of the limiting block 402 in the left-right direction, a fourth screw groove 404 is formed in the outer end of the inner groove 401 in the left-right direction, and the second bolt 405 is installed inside the third screw groove 403 and the fourth screw groove 404 in a meshed mode; the angle size of the inner pipeline in butt joint can be conveniently adjusted according to the requirement;
the limiting mechanism comprises a limiting groove 601, a clamping plate 602 and a spring 603, the limiting groove 601 is formed in the upper and lower parts of the left side and the right side of the connecting rod 5, the clamping plate 602 is installed in the limiting groove 601, and the spring 603 is installed in the limiting groove 601 on the vertical outer side of the clamping plate 602; it is spacing to be convenient for effectual internal pipeline to carry out the centre gripping, has avoided random winding.
Wherein, the size of the cannula head 202 is matched with that of the slot 206; the heat tracing pipe is more quickly and efficiently disassembled or assembled.
Wherein, the limiting block 402 is arc-shaped and is embedded with the circular inner groove 401; the angle size of the inner pipeline can be adjusted more efficiently and stably.
Wherein, the thread of the outer wall of the first bolt 205 is meshed with the thread of the inner wall of the first screw groove 203 and the second screw groove 204; the main pipe 1 of the heat tracing pipe after being installed is more firmly fixed.
Wherein, the thread of the outer wall of the second bolt 405 is meshed with the thread of the inner wall of the third screw groove 403 and the fourth screw groove 404; and fixing the position of the inner pipeline with the adjusted angle size.
Wherein, the inner end surface of the clamping plate 602 is serrated; the two ends of the inner pipeline are clamped more firmly.
Wherein, the limiting groove 601 inclines towards the center of the vertical outer end; the clamping of different sizes of inner pipelines in the circular pipe body is facilitated.
A method for installing a heat tracing pipe convenient for intermittent replacement comprises the following steps:
the method comprises the following steps: firstly, a wrench is used for rotating the first bolts 205 on the left side and the right side of the main pipe 1 needing to be replaced by sections in a meshing manner, so that the bolts are taken out from the first thread grooves 203 and the second thread grooves 204 in a rotating manner, the insertion pipe head 202 at the right end of the main pipe 1 on the left side of the damaged main pipe 1 is pulled leftwards to be separated from the insertion groove 206 on the left side of the damaged main pipe 1, and then the insertion pipe head 202 at the right end of the damaged main pipe 1 is separated from the insertion groove 206 on the main pipe 1 on the right end of the damaged main pipe 1;
step two: fusing the wiring ends of the inner pipelines exposed out of the two ends of the damaged main pipe 1 by using a welding gun, and then independently detaching the damaged main pipe 1;
step three: manually pulling the clamping plates 602 to the upper side and the lower side with manual force to enable the clamping plates to slide towards the outer ends in the limiting grooves 601 to extrude the springs 603, wherein the springs 603 are extruded and contracted to change kinetic energy into elastic potential energy, the replaced new inner pipelines are respectively inserted into the main pipe 1 from the gaps of the clamping plates 602, two ends of each inner pipeline are positioned between the clamping plates 602 at two ends of the main pipe 1, the tension on the clamping plates 602 is loosened, the springs 603 convert the elastic potential energy into the kinetic energy, and the serrated clamping plates 602 firmly clamp the inner pipelines with different sizes;
step four: manually twisting the connecting rod 5 to drive the circular-arc limiting blocks 402 with the upper side and the lower side embedded in the inner grooves 401 to rotate in the inner grooves 401 in a fitting manner, so that the rotating size of the connecting rod 5 is adjusted according to the requirement of the wire connection torsion angle of the inner pipe, after the adjustment, the third screw grooves 403 at the outer ends of the limiting blocks 402 are aligned with the fourth screw grooves 404 arranged in the outer ends of the fixed inner rings 3 at the corresponding positions after the adjustment, and a screwdriver is used for mounting the second bolts 405 in the third screw grooves 403 and the fourth screw grooves 404 in a meshing and rotating manner, so that the fixing of the connecting rod 5 can be completed, and the fixation of the torsion position of the clamped inner pipe can also be completed;
step five: the two ends of the inner pipeline are respectively welded with the inner pipeline inside the main pipe 1 on two sides of the main pipe 1 to be replaced, the main pipe 1 is made of a tough material, so that the main pipe 1 can be bent when the inserting pipe head 202 is inserted into the left inserting groove 206 of the main pipe 1 to be replaced, the inserting pipe heads 202 on two sides are respectively inserted into the inserting grooves 206, the first thread groove 203 and the second thread groove 204 are aligned, the first bolt 205 is meshed and installed inside the first thread groove 203 and the second thread groove 204, and the independent installation of replacing the heat tracing pipe can be completed again.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a companion's heat pipe convenient to discontinuous change which characterized in that: the quick-release mechanism convenient to disassemble independently is mounted on the left side and the right side of the main pipe (1), fixed inner rings (3) are mounted inside the left end and the right end of the main pipe (1), the position adjusting mechanism convenient to adjust correspondingly according to the torsion angle of the built-in pipeline is mounted inside the fixed inner rings (3), a connecting rod (5) is mounted in the center of the position adjusting mechanism, and limiting mechanisms for effectively clamping the end heads of the built-in pipeline are mounted inside the front side and the rear side of the connecting rod (5);
the quick release mechanism comprises a tube seat (201), a tube inserting head (202) and a first bolt (205), the tube seat (201) is welded on the outer portion of the left end of a main tube (1), a slot (206) is formed in the left end of the tube seat (201), the tube inserting head (202) is welded on the outer wall of the right end of the main tube (1), a first spiral groove (203) is formed in the center of the front side and the rear side of the tube seat (201), second spiral grooves (204) are formed in positions, corresponding to the first spiral grooves (203), of the front side and the rear side of the tube inserting head (202), and the first bolt (205) is meshed and installed in the first spiral grooves (203);
the positioning mechanism comprises an inner groove (401), a limiting block (402) and a second bolt (405), the inner groove (401) is arranged inside the edge of the fixed inner ring (3), the limiting block (402) is embedded inside the inner groove (401), a third screw groove (403) is formed inside the outer end of the limiting block (402) in the left-right direction, a fourth screw groove (404) is formed inside the outer end of the inner groove (401) in the left-right direction, and the second bolt (405) is installed inside the third screw groove (403) and the fourth screw groove (404) in a meshed mode;
stop gear includes spacing groove (601), splint (602) and spring (603), spacing groove (601) are seted up inside about connecting rod (5) left and right sides, install inside spacing groove (601) splint (602), install in spacing groove (601) in the vertical outside of splint (602) spring (603).
2. The heat trace pipe facilitating intermittent replacement according to claim 1, wherein: the size of the cannula head (202) is matched with that of the cannula (206).
3. The heat trace pipe facilitating intermittent replacement according to claim 1, wherein: the limiting block (402) is arc-shaped and is embedded with the circular inner groove (401).
4. The heat trace pipe facilitating intermittent replacement according to claim 1, wherein: the threads on the outer wall of the first bolt (205) are meshed with the threads on the inner wall of the first screw groove (203) and the second screw groove (204).
5. The heat trace pipe facilitating intermittent replacement according to claim 1, wherein: the threads on the outer wall of the second bolt (405) are meshed with the threads on the inner walls of the third screw groove (403) and the fourth screw groove (404).
6. The heat trace pipe facilitating intermittent replacement according to claim 1, wherein: the inner end surface of the clamping plate (602) is serrated.
7. The heat trace pipe facilitating intermittent replacement according to claim 1, wherein: the limiting groove (601) inclines towards the center of the vertical outer end.
8. The method for installing a heat tracing pipe convenient for intermittent replacement according to any one of claims 1 to 7, wherein: the method comprises the following steps:
the method comprises the following steps: firstly, a spanner is used for enabling first bolts (205) on the left side and the right side of a main pipe (1) needing to be replaced to rotate through meshing so as to be taken out from the inside of a first thread groove (203) and a second thread groove (204), an insertion pipe head (202) at the right end of the main pipe (1) on the left side of a damaged main pipe (1) is pulled leftwards so as to be separated from an insertion groove (206) on the left side of the damaged main pipe (1), and then the insertion pipe head (202) at the right end of the damaged main pipe (1) is separated from the insertion groove (206) of the main pipe (1) on the right end of the damaged main pipe (1);
step two: fusing the wiring ends of the inner pipelines exposed out of the two ends of the damaged main pipe (1) by using a welding gun, and then independently detaching the damaged main pipe (1);
step three: manually and forcefully pulling the clamping plates (602) to enable the clamping plates to slide towards the outer end in the limiting groove (601) to extrude the spring (603), the spring (603) is extruded and contracted to change kinetic energy into elastic potential energy, the replaced new inner pipelines are respectively inserted into the main pipe (1) from the gaps of the clamping plates (602), the two ends of each inner pipeline are positioned between the clamping plates (602) at the two ends of the main pipe (1), the pulling force on the clamping plates (602) is released, the spring (603) converts the elastic potential energy into the kinetic energy, and the serrated clamping plates (602) firmly clamp the inner pipelines with different sizes;
step four: manually twisting the connecting rod (5) to drive the circular-arc-shaped limiting blocks (402) with the upper and lower sides embedded in the inner grooves (401) to rotate in the inner grooves (401) in a fitting manner, so that the rotating size of the connecting rod (5) is adjusted according to the requirement of the wiring torsion angle of the inner pipeline, after adjustment, the third screw grooves (403) at the outer ends of the limiting blocks (402) are aligned with the fourth screw grooves (404) formed in the outer ends of the fixed inner rings (3) at the corresponding positions after adjustment, and a screwdriver is used for mounting the second bolts (405) in the third screw grooves (403) and the fourth screw grooves (404) through meshing rotation, so that the fixing of the connecting rod (5) can be completed, and the fixing of the torsion position of the clamped inner pipeline is also completed;
step five: the two ends of the inner pipeline are respectively welded with the inner pipeline inside the main pipe (1) on two sides of the main pipe (1) to be replaced, the main pipe (1) is made of a flexible material, so that the main pipe (1) can be bent when the inserting pipe head (202) is inserted into the left inserting groove (206) of the main pipe (1) to be replaced, the inserting pipe heads (202) on two sides are respectively inserted into the inserting grooves (206), the first spiral groove (203) is aligned with the second spiral groove (204), the first bolt (205) is meshed and installed inside the first spiral groove (203) and the second spiral groove (204), and the independent installation of replacing the heat tracing pipe can be completed again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111275160.3A CN114001229B (en) | 2021-10-29 | 2021-10-29 | Heat tracing pipe convenient for intermittent replacement and installation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111275160.3A CN114001229B (en) | 2021-10-29 | 2021-10-29 | Heat tracing pipe convenient for intermittent replacement and installation method thereof |
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| Publication Number | Publication Date |
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| CN114001229A CN114001229A (en) | 2022-02-01 |
| CN114001229B true CN114001229B (en) | 2023-03-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101998132B1 (en) * | 2019-02-28 | 2019-07-09 | 주식회사 토문엔지니어링건축사사무소 | Piping apparatus being easy to install at building |
| CN211289164U (en) * | 2019-12-19 | 2020-08-18 | 广州纳航信息科技有限公司 | Prefabricated heat preservation section bar of electrified heat tracing pipe |
| CN211175671U (en) * | 2020-01-04 | 2020-08-04 | 刘妹仔 | Hydraulic pipeline bearing structure for hydraulic engineering |
| CN213479451U (en) * | 2020-08-30 | 2021-06-18 | 银江建设(辽宁)有限公司 | Ventilating duct with good sealing performance |
| CN112303369A (en) * | 2020-10-28 | 2021-02-02 | 安邦电气股份有限公司 | Energy-saving electric tracing band for tunnel fire fighting |
| CN213712183U (en) * | 2020-11-09 | 2021-07-16 | 天津市乾丰防腐保温工程有限公司 | A erection joint for insulating tube |
| CN214197568U (en) * | 2020-12-26 | 2021-09-14 | 张俊中 | Pipeline laying frame for hydraulic engineering |
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