CN101586448A - Production technique and devices for hot spraying alloy coating on polished pumping rod - Google Patents
Production technique and devices for hot spraying alloy coating on polished pumping rod Download PDFInfo
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- CN101586448A CN101586448A CNA2008101125812A CN200810112581A CN101586448A CN 101586448 A CN101586448 A CN 101586448A CN A2008101125812 A CNA2008101125812 A CN A2008101125812A CN 200810112581 A CN200810112581 A CN 200810112581A CN 101586448 A CN101586448 A CN 101586448A
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Abstract
The invention relates to a production technique and devices for hot spraying an alloy coating on the surface of a polished pumping rod. The production technique comprises the following steps: (1) carrying out roughening treatment on the surface of the polished pumping rod to prepare for surface spraying; (2) carrying out hot spraying, remelting and tempering treatment on the surface of the polished pumping rod treated by the roughening treatment; and (3) polishing and burnishing the surface with the coating to finish the final surface treatment. The used devices comprise a first surface spray painting machine, a second surface spray painting machine, a surface roughing machine, a surface abrasive finishing machine, a first roller conveying line, a second roller conveying line and an automatic manipulator. The production technique and the devices improve the stability of the devices and the interchangeability of parts, reduce the fault rate and the maintenance time of the devices, reduce the requirement on operator, improve the production quality, and facilitate the further simplification of the production supervision.
Description
Technical field
The present invention relates to a kind of novel alloy coating hot spray oil pumping polish rod production line, belong to the oil equipment field.
Background technology
In petroleum industry, the oil pumper sucker rod pumping is a kind of artificial lift oil production method, and is simple with its equipment, small investment, and convenient management, advantage such as compliance is strong is extensively adopted by each oil field both at home and abroad.Oil pumper, sucker rod and oil well pump are three chief components of sucker rod pumping equipment, and wherein sucker rod is the motion and the transmission of power of oil pumper are carried out pumping to downhole pump parts.Oil pumping polish rod is the different sucker rod of rod string top one Gent, be used for and well head seal box fitted seal mouth of pumped oil well, therefore condition of work is more abominable than sucker rod, except that the condition of work of sucker rod, oil pumping polish rod in the exposed atmosphere in the open air, is immersed in during down stroke in the well liquid when upstroke, therefore oil pumping polish rod both had been subjected to atmospheric corrosion, being subjected to the well corrosion again, also will not bearing high temperature when fuel-displaced, is the harshest different sucker rod of a Gent of condition of work.
For this reason, oil pumping polish rod being carried out surfacing is to prolong its application life the most effectively to handle means to improve its corrosion resistance and abrasion resistance.Surface treatment method commonly used at present comprises electrodeposited chromium, chemical nickel phosphorus plating and alloy coating hot-spraying technology.
The electrodeposited chromium technology is to plate one deck chromium topping on the oil pumping polish rod surface by plating; this case hardness height, highly polished, certain abrasion resistance and corrosion resistance arranged; slowed down the corrosion resistance of oil pumping polish rod to a certain extent; but because electrodeposited coating and matrix bond are not tight; tangible interface is arranged between electrodeposited coating and the matrix; it is very big that the composition of both sides, interface matrix and electrodeposited coating differs, and its chemical potential difference is also very big.In case surface electrical coating owing to hard particles for example the scuffing of sand grains defective appears, after causing the exposing of matrix, under electrochemical action, corrosion process can be that the interface is expanded rapidly along the position of potential difference maximum, finally cause the sheet of coating to peel off, cause the corrosion failure of oil pumping polish rod.In addition, the chemical nickel phosphorus plating technology also with the electrodeposited chromium technology type seemingly, nickel-phosphorus coating can sheet after the scuffing that is subjected to hard particles peels off, and causes the oil pumping polish rod corrosion failure.
The alloy coating hot-spraying technology is will have the alloy material spraying that anticorrosive wear-resistant decreases performance by plasma spray technology to be covered in the oil pumping polish rod surface, and make coating material and matrix material form metallurgical binding by remelting processing, the composition of coating and the composition of matrix be mutual scattering and permeating in reflow process, between coating and matrix material, there is certain thickness transition region, the composition that makes coating arrive matrix changes slow relatively, avoided the formation at the interface of composition sudden change, also problem with regard to having avoided chrome plating and nickel-phosphorus coating after defective appears in the surface, to cause the coating sheet to come off because of the expansion of corroding.
But, because alloy coating hot-spraying technology work flow relative complex, and oil pumping polish rod is typical ultra-fine stock class part, and it is very high to cause that oil pumping polish rod is carried out surface heat spray process difficulty, does not therefore also have special alloy coating hot spray oil pumping polish rod production line.The mode of production is that sucker rod hard surfacing equipment is carried out scrap build comparatively widely at present, utilize quenching apparatus to finish the preheating to the body of rod, the remelting processing of body of rod face coat, utilize the abrasive band bistrique on the sucker rod hard surfacing equipment that the is placed on side that increases in addition and the thermal spraying treatment that the flame heat spray spray gun is finished body of rod surface coarsening, coating polishing grinding and body of rod surface alloy coating.In addition, because sucker rod hard surfacing equipment is oblique roller nature supporting way to the supporting way of sucker rod workpiece, being about to the sucker rod free state is placed on a row and sucker rod axis and is on the roller that an angle places, after rotating, roller utilize frictional force to drive workpiece axially rotation on the one hand, move axially promptly spiral advancing simultaneously on the one hand.Kinetic stability is very poor owing to the size characteristics of its ultra-fine length for sucker rod in this process, and beating degree is very high, has had a strong impact on the polishing on body of rod surface, the crudy of face coat thermal spraying treatment.Therefore also need workpiece support and move mode are transformed, the spiral progression of workpiece is decomposed into independently rotation and moves axially two motion modes, utilize the permanent position roller to support support and the rotation that realizes workpiece, guide rail cart drive workpiece moves on guide rail and realizes moving axially of workpiece.
Can realize the thermal spray process of either of the face coat of oil pumping polish rod though use the equipment of this transformation, but because the processing of each operation is all on same equipment, each operation is different to the requirement of equipment and workpiece, and is different to the influence of equipment and workpiece, the contradiction between the different process can occur.In whole process of production, the thermal spraying treatment of alloy coat and intermediate frequency remelting heat treated require very high to the precision of equipment and the smoothness of workpiece operation, in order to improve intermediate frequency remelting effect and efficient, heating in medium frequency coil distance body of rod surface distance is very little, generally be no more than 1cm, this just requires the beating degree of workpiece very little.On the other hand, when utilizing the abrasive band bistrique that grinding process is carried out on the polished rod surface, in order to guarantee certain polishing effect and grinding efficiency, bistrique can be very high to the following compressive load of the body of rod, this just causes workpiece stressed and vibration that the generation amplitude is very big in bruting process, and what cause that workpiece do not stop in traveling process beats, and very easily contacts and strike the heating in medium frequency coil, cause the damage of equipment, equipment failure rate is very high.
In addition, use this equipment can only carry out single and mini-batch production production, production efficiency is low; The multiple operation integrated equipment requires high to operator's operation, be prone to the human operational error, cause decrease in yield, these all greatly reduce the alloy coating hot-spraying polished rod competitiveness of product in market, have influenced the extensive popularization of this outstanding process for treating surface of plasma spray technology in the oil equipment field.
Summary of the invention
The purpose of this invention is to provide a kind of novel alloy coating hot spray oil pumping polish rod production line, this production line sets out according to the size characteristics of hot-spraying technique and this slender rod type part of oil pumping polish rod, the thinking that the non-standard equipment that uses self-control to transform before changing carries out single-piece work, whole alloy coating on surface of polished pumping rod hot-spraying technique is decomposed, use more general standard production equipment to produce to each operation after decomposing, and with the production equipment of each operation according to the rational row's of production group of production efficiency optimization criteria, form complete alloy coating hot spray oil pumping polish rod production line by automatic loading/unloading and transport sector.Use this alloy coating hot spray oil pumping polish rod production line to produce, owing to using standardized equipment to improve the stability and the component interchangeability of equipment, effectively reduce breakdown rate and maintenance time, and by each operation reasonably row of production group and proportioning, effective optimization process time, thereby increased substantially production efficiency, made the thermal spray process of either of alloy coating on surface of polished pumping rod become more standardized production procedure, be convenient to the more production and operation management of standard.
For achieving the above object, the present invention takes following mentality of designing to carry out the schematic design of alloy coating hot spray oil pumping polish rod production line:
1, decompose present oil pumping polish rod thermal spraying treatment technology, obtain operation: material loading → surface coarsening → surperficial preheating → surface heat spraying alloy powder → coating is carried out remelting and water cooling cooling → coating is carried out tempering heat treatment → polishing → blanking is carried out on the surface.
2, analyze each operation and with being connected of front and back operation, the relevant operation that can't cut apart and be easy to be associated together is divided into groups, obtain following three operation groups: pre-treatment group (comprising material loading, surface coarsening), coating processed group (comprise surperficial preheating, surface heat spraying alloy powder, coating is carried out remelting and water cooling cooling, coating is carried out tempering heat treatment), post processing group (comprise polishing, blanking are carried out in the surface).
3, the technology of each operation group is carried out refinement, form independently treatment process.And determine process equipment in conjunction with conventional manufacturing process.Obtain equipment as shown in the table and processing technology inventory thereof.
| Device name | Function | Work flow |
| The surface coarsening machine | Roughening treatment is carried out on the oil pumping polish rod surface, for the surface spraying is prepared | Material loading, alligatoring polishing, blanking |
| The surface flush coater | Hot spraying, remelting, tempering heat treatment are carried out in the surface | Material loading, pre-hot spraying, remelting water-cooled, tempering, blanking |
| Surface polishing machine | Polishing grinding is carried out on the surface of coating finish final surfacing | Material loading, polishing, blanking. |
4, add up process time of each equipment and operation and carry out analysis optimization, determine that the best equipment proportioning is 1 surface coarsening machine, 2 surperficial flush coaters and 1 surface polishing machine.
5, there is the workpiece transfermatic to be used for the transmission of workpiece between each equipment in design and installation between each equipment, simultaneously between each equipment and transfermatic, automatic manipulator is installed, actions such as the snatch by manipulator, upset are to realize the automatic upper and lower material of workpiece from equipment to the transmission line.
The technical solution used in the present invention is: a kind of production process for hot spraying alloy coating on polished pumping rod, it is characterized in that, and comprise the steps:
(1) roughening treatment is carried out on the oil pumping polish rod surface, for the surface spraying is prepared;
(2) hot spraying, remelting, tempering heat treatment are carried out in the oil pumping polish rod surface through roughening treatment;
(3) polishing grinding is carried out on the surface of coating and finish final surfacing.
Another technical scheme of the present invention has provided employed device in the above-mentioned production technology, it comprises: the first surface flush coater, the second surface flush coater, the surface coarsening machine, surface polishing machine, the first roller pipeline and the second roller pipeline, first surface flush coater and second surface flush coater opposing parallel are placed, the first roller pipeline and the second roller pipeline be arranged in parallel, the stem of the afterbody of the first roller pipeline and the second roller pipeline is adjacent and between first surface flush coater and second surface flush coater, the surface coarsening machine is located at the left side of first surface flush coater or second surface flush coater and is positioned at first roller pipeline next door, surface polishing machine is located at the right side of first surface flush coater or second surface flush coater and is positioned at second roller pipeline next door, surface coarsening machine, the first surface flush coater, the next door of second surface flush coater and surface polishing machine is respectively equipped with three two and refers to the formula automatic manipulator.
Described first surface flush coater and second surface flush coater are respectively by guide rail car be arranged on guide rail car other flame heat spray equipment and frequency heating device and form, the heating in medium frequency coil of frequency heating device and supporting cooling hydrosphere are arranged on the right-hand member of the car body of guide rail car from left to right, the dead in line of the left and right chuck of the heating in medium frequency coil of frequency heating device and the axis of supporting cooling hydrosphere and guide rail car, the spray gun of flame heat spray equipment is between the right chuck of the supporting cooling hydrosphere of frequency heating device and guide rail car.
After adopting production line of the present invention, 1 surface alloy coating polished rod product of original approximately production in per 50 minutes becomes approximately produced 2 surface alloy coating polished rod products in per 20 minutes, and production efficiency has improved more than 300%.
Advantage of the present invention is:
1, the present invention makes the production of oil pumping polish rod surface spraying can use more standard device by technological improvement, has reduced difficulty of processing, fault rate and the maintenance cost of equipment.Help the popularization of this production technology.
2, this production line decomposes refinement with whole process, and use special equipment to carry out special explained hereafter, reduced the operator significantly to the operation of equipment, the technical requirements that maintenance technology requires, reduced labour intensity and, improved the quality of production, made further being simplified of production management.
3, this Production Line efficient with compare than original production process, improved more than 300%.
Description of drawings
Fig. 1 is the employed setting drawing of this production technology.
The specific embodiment
As shown in Figure 1, the process units of a kind of hot spraying alloy coating on surface of polished pumping rod of the present invention, it comprises: first surface flush coater 2, second surface flush coater 4, surface coarsening machine 1, surface polishing machine 3, the first roller pipeline 5 and the second roller pipeline 6, first surface flush coater 2 and second surface flush coater 4 opposing parallel are placed, distance between first surface flush coater 2 and the second surface flush coater 4 is 2 meters, the first roller pipeline 5 and the second roller pipeline 6 be arranged in parallel, the stem of the afterbody of the first roller pipeline 5 and the second roller pipeline 6 is adjacent and between first surface flush coater 2 and second surface flush coater 4, surface coarsening machine 1 is located at the left side of first surface flush coater 2 or second surface flush coater 4 and is positioned at the first roller pipeline, 5 next doors, surface polishing machine 3 is located at the right side of first surface flush coater 2 or second surface flush coater 4 and is positioned at the second roller pipeline, 6 next doors, surface coarsening machine 1, first surface flush coater 2, the next door of second surface flush coater 4 and surface polishing machine 3 is respectively equipped with three two and refers to formula automatic manipulator 7.The 2M5015B molding sand band grinding machine that the 2M5015 molding sand band grinding machine that above-mentioned surface coarsening machine 1 adopts Chongqing rich beneficial abrasive belt grinding machine Co., Ltd to produce, surface polishing machine 3 adopt Chongqing rich beneficial abrasive belt grinding machine Co., Ltd to produce.
First surface flush coater 2 and second surface flush coater 4 are respectively by guide rail car 18, flame heat spray equipment 19 and the heating in medium frequency equipment 10 other with being arranged on guide rail car are formed, the heating in medium frequency coil 11 of frequency heating device 10 and supporting cooling hydrosphere 12 are arranged on guide rail car 18 right-hand members from left to right, the left side of the heating in medium frequency coil 11 of frequency heating device 10 and the axis of supporting cooling hydrosphere 12 and guide rail car 18, right chuck 13,14 dead in line, the spray gun 15 of flame heat spray equipment is between the supporting cooling hydrosphere 12 and the right chuck 14 of guide rail car of frequency heating device, the muzzle of the spray gun 15 of flame heat spray equipment is horizontally disposed with and apart from guide rail car chuck axis 180mm, heating in medium frequency coil 11, supporting cooling hydrosphere 12 and spray gun 15 relative spacings are 300mm, can realize at work best spraying effect and the heating in oil pumping polish rod surface to guarantee surperficial flush coater, the remelting effect.Wherein, guide rail car 18 adopts Beijing to think the SWCH1530 guide rail car that Weisheng industrial engineering (IE) technology Co., Ltd produces; flame heat spray equipment 19 adopts the DZ-5000 flame heat spray equipment of Surface Engineering research institute of the Chinese Academy of Agricultural Sciences, and heating in medium frequency equipment 10 adopts the 160KW/8KC heating in medium frequency equipment of Shanghai her induction heating equipment Co., Ltd of China.
A kind of production process for hot spraying alloy coating on polished pumping rod, it is realized by following steps:
One, equipment is formed: select a surface coarsening machine, two surperficial flush coaters and a surface polishing machine.The 2M5015 molding sand band grinding machine that the surface coarsening machine adopts Chongqing rich beneficial abrasive belt grinding machine Co., Ltd to produce; the surface flush coater adopts Beijing to think the SWCH1530 lathe that Weisheng industrial engineering (IE) technology Co., Ltd produces; and being equipped with the DZ-5000 flame heat spray equipment of Surface Engineering research institute of the Chinese Academy of Agricultural Sciences and the 160KW/8KC heating in medium frequency equipment of Shanghai her induction heating equipment Co., Ltd of China, surface polishing machine adopts the 2M5015B molding sand band grinding machine of Chongqing rich beneficial abrasive belt grinding machine Co., Ltd production.
Two, the assembling of surface flush coater: DZ-5000 flame heat spray equipment and 160KW/8KC heating in medium frequency equipment are placed in, make the spray gun muzzle horizontal range SW1530 lathe workpiece axis 180mm of DZ-5000 flame-spraying equipment, the heater coil and the supporting cooling hydrosphere of heating in medium frequency equipment are placed on SW1530 lathe track centre position, be respectively 60cm and 30cm to the spray gun distance, the axis of heater coil and supporting cooling hydrosphere and SW1530 lathe workpiece axis coaxle can be realized best spraying effect and the heating in oil pumping polish rod surface at work to guarantee surperficial flush coater, the remelting effect.
Three, the construction of production line: two surperficial flush coaters are placed side by side, 2 meters of spacings.Surface coarsening machine and surface polishing machine are placed on the wherein both sides of a surperficial flush coater respectively, and four equipment are one two one layouts.Position between two surperficial flush coaters two the polished rod transfermatics of arranging, article one, the transmission line polished rod of being responsible for the surface coarsening machine is finished alligatoring is transferred to surperficial flush coater place, and the second transmission line is responsible for the polished rod that surperficial flush coater is finished after the spraying is transferred to the surface polishing machine place.In addition, all be mounted with 3 manipulators of synchronization action between each equipment and transfermatic, robot end is V-type pincers, and grabbing workpiece and overturn mobilely is used for the loading and unloading between equipment and the transfermatic very easily.Each device layout of production line is referring to Fig. 1.
Three, the surface coarsening of oil pumping polish rod is handled: the oil pumping polish rod that the blank storage area is to be processed is positioned over article one transmission line section start, and transfermatic is transferred to polished rod surface coarsening machine place automatically.The other synchronous automatic manipulator grabbing workpiece of surface coarsening machine is positioned on the surface coarsening machine, and the surface coarsening machine starts, and begins the alligatoring polishing is carried out on the polished rod surface.Treat that whole polished rod surface finish finishes the rear surface roughing machine and quit work, automatic manipulator polished rod that roughening treatment is finished unloads from the surface coarsening machine and is positioned on article one transfermatic synchronously.
Four, the surperficial spray treatment of oil pumping polish rod: article one transfermatic continues operation, and the polished rod after the alligatoring is transferred to surperficial flush coater place, and the polished rod of the other synchronous automatic manipulator of surperficial flush coater after with roughening treatment grasps and be positioned on the surperficial flush coater.Start surperficial flush coater workpiece rotary control switch, polished rod begins uniform rotation.Start the lathe gauge tap of advancing, lathe drives polished rod and moves along the guide rail forward, polished rod starts heater coil preheating is carried out on the polished rod surface when one is passed the Frequency Induction Heating coil, treats that closing the Frequency Induction Heating coil after whole polished rod is by heater coil finishes body of rod preheating.Lathe drives polished rod to begin oppositely to move along guide rail from the other end, start the oxyacetylene torch thermal spray system during through flame gun the polished rod surface is sprayed, treat to close the spraying that the flame heat spray system finishes body of rod surface alloy coating after whole polished rod is by spray gun.Polished rod after lathe drive spraying forward once more moves, pass the Frequency Induction Heating coil from one, start the heating in medium frequency coil coating is carried out the remelting processing, start supporting chilled water unit simultaneously, water-cooled is carried out on remelting body of rod surface later, treat to close frequency heating device and supporting chilled water unit after whole polished rod is by heater coil and cooling hydrosphere, finish the remelting of body of rod face coat is handled.The polished rod that lathe drives after remelting is handled oppositely moves once more, when one is passed the heating in medium frequency coil, start the heating in medium frequency coil and again the polished rod body of rod is carried out tempering heat treatment, treat that closing the heating in medium frequency coil after whole polished rod is by heater coil finishes tempering heat treatment.Close whirligig and stop the rotation of polished rod, the polished rod after automatic manipulator is finished the surface spraying synchronously unloads from surperficial flush coater and is placed on the second transmission line.
Five, the surface finish of oil pumping polish rod: the polished rod that the second transmission line will be finished spray treatment is transferred to the surface polishing machine place automatically, automatic manipulator grasps the polished rod on the transmission line and is positioned on the surface polishing machine synchronously, surface polishing machine starts, and begins polishing grinding is carried out on the polished rod surface.Treat whole polished rod surface finish polishing finish after the closing surface polishing machine, the polished rod that synchronous automatic manipulator is finished polishing unloads from the surface coarsening machine and is positioned on the second transfermatic, the polished rod that the transmission line operation will be finished processing is transferred to the products storage district forward, promptly finishes whole process of production.
Claims (3)
1, a kind of production process for hot spraying alloy coating on polished pumping rod is characterized in that, comprises the steps:
(1) roughening treatment is carried out on the oil pumping polish rod surface, for the surface spraying is prepared;
(2) hot spraying, remelting, tempering heat treatment are carried out in the oil pumping polish rod surface through roughening treatment;
(3) polishing grinding is carried out on the surface of coating and finish final surfacing.
2, employed device in the production technology as claimed in claim 1, it is characterized in that, it comprises: the first surface flush coater, the second surface flush coater, the surface coarsening machine, surface polishing machine, the first roller pipeline and the second roller pipeline, first surface flush coater and second surface flush coater opposing parallel are placed, the first roller pipeline and the second roller pipeline be arranged in parallel, the stem of the afterbody of the first roller pipeline and the second roller pipeline is adjacent and between first surface flush coater and second surface flush coater, the surface coarsening machine is located at the left side of first surface flush coater or second surface flush coater and is positioned at first roller pipeline next door, surface polishing machine is located at the right side of first surface flush coater or second surface flush coater and is positioned at second roller pipeline next door, surface coarsening machine, the first surface flush coater, the next door of second surface flush coater and surface polishing machine is respectively equipped with three two and refers to the formula automatic manipulator.
3, device as claimed in claim 2, it is characterized in that, first surface flush coater and second surface flush coater are respectively by guide rail car, flame heat spray equipment and the frequency heating device other with being arranged on guide rail car are formed, the heating in medium frequency coil of frequency heating device and supporting cooling hydrosphere are arranged on the right-hand member of the car body of guide rail car from left to right, the heating in medium frequency coil of frequency heating device and the axis of supporting cooling hydrosphere and the left side of guide rail car, the dead in line of right chuck, the spray gun of flame heat spray equipment is between the right chuck of the supporting cooling hydrosphere of frequency heating device and guide rail car.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101125812A CN101586448A (en) | 2008-05-23 | 2008-05-23 | Production technique and devices for hot spraying alloy coating on polished pumping rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101125812A CN101586448A (en) | 2008-05-23 | 2008-05-23 | Production technique and devices for hot spraying alloy coating on polished pumping rod |
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| CN101586448A true CN101586448A (en) | 2009-11-25 |
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| CNA2008101125812A Pending CN101586448A (en) | 2008-05-23 | 2008-05-23 | Production technique and devices for hot spraying alloy coating on polished pumping rod |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107953114A (en) * | 2017-12-25 | 2018-04-24 | 重庆耐世特转向系统有限公司 | Wheel steering system high density tooth jackshaft production line |
| CN111893284A (en) * | 2020-08-11 | 2020-11-06 | 象山旭雯钢铁科技有限公司 | Device for processing steel material flow |
| CN111980628A (en) * | 2020-09-11 | 2020-11-24 | 江苏思澳环保科技有限公司 | Oil-gas pipe heat insulation protection method for improving temperature of oil-gas wellhead |
-
2008
- 2008-05-23 CN CNA2008101125812A patent/CN101586448A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107953114A (en) * | 2017-12-25 | 2018-04-24 | 重庆耐世特转向系统有限公司 | Wheel steering system high density tooth jackshaft production line |
| CN107953114B (en) * | 2017-12-25 | 2023-11-10 | 重庆耐世特转向系统有限公司 | High-density tooth intermediate shaft production line of vehicle steering system |
| CN111893284A (en) * | 2020-08-11 | 2020-11-06 | 象山旭雯钢铁科技有限公司 | Device for processing steel material flow |
| CN111980628A (en) * | 2020-09-11 | 2020-11-24 | 江苏思澳环保科技有限公司 | Oil-gas pipe heat insulation protection method for improving temperature of oil-gas wellhead |
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Open date: 20091125 |