CN100500884C - Medium frequency induction heating treatment system for steel pipe, petroleum well pipe and drill pipe - Google Patents
Medium frequency induction heating treatment system for steel pipe, petroleum well pipe and drill pipe Download PDFInfo
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- CN100500884C CN100500884C CNB2007100247466A CN200710024746A CN100500884C CN 100500884 C CN100500884 C CN 100500884C CN B2007100247466 A CNB2007100247466 A CN B2007100247466A CN 200710024746 A CN200710024746 A CN 200710024746A CN 100500884 C CN100500884 C CN 100500884C
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Abstract
This invention provides a kind of intermediate-frequency induction heating system used in the frequency treatment system of steel pipe, tube and drill pipe of oil well. This system comprises of work piece storage platform, automatic alignment localization device, quenching and heating roller, quenching inducing heater, double color infrared thermodetector, spray quenching equipment, detearing platform, temper heating roller, temper inducing heater, infrared thermometer controller, descaling device and cooling platform. The heating roller ensures the work piece be heated uniformly and the heated work piece won' t be straightened, which can decrease the cost. The spray quenching equipment ensures the work piece be quenched entire uniformly and quickly. And the descaling device makes the surface of the work piece brightly. The detearing platform makes the work piece move automatically and eject the water,which could influence the heating effect. And the water and steam also could not enter the heating inducing loop it would decrease the life of the loop.
Description
Technical field
What the present invention relates to is steel pipe, oil well pipe and drilling rod Frequency Induction Heating heat treatment system, belongs to steel pipe heat treatment technics field.
Background technology
Thermal source in existing steel pipe, oil well pipe and the drilling rod heat treating method mainly is with gas (as liquefied gas, Sweet natural gas, gas maked coal), and as the heating thermal source in the heat treatment system, its major defect is with gas, environment there is pollution, have potential safety hazard, oxide skin is many, the cost height.Prior art is except using gas as the heating thermal source, equipment such as used heating roller-way, spraying and quenching device, descaling device, water leaching table all have defective, can't guarantee workpiece steel pipe or oil well pipe or drilling rod rotation in heat-treatment process as used heating roller-way, workpiece steel pipe or oil well pipe or drilling rod heat inhomogeneous in heat-treatment process, workpiece steel pipe after the heating or oil well pipe or drilling rod must increase production cost through the straightener alignment through behind this roller-way.Can't make the evenly through hardening fully rapidly of steel pipe, oil well pipe and drilling rod in the spray as used spraying and quenching device continuously with line, and to steel pipe, oil well pipe and the drilling rod planeness of about 10 meters length, 0.2% of the uncontrollable total length that measures the other end from pipe one end.In each end 1524mm scope, must not exceed 3.175mm.As used descaling device workpiece steel pipe or oil well pipe or drilling rod are heat-treated in the process steel pipe after tempered at roller-way by behind this descaling device, finished product workpiece steel pipe or oil well pipe or drilling rod surface-brightening can't reach true qualities.As used water leaching table, this water leaching table is a planar, it can't make workpiece steel pipe or oil well pipe or drilling rod automatic shifting, also can't make workpiece steel pipe or oil well pipe or drilling rod on water leaching table during automatic shifting, to have a spot of ponding not discharge behind spray quench in the pipe and remove totally, water can bring to the tempering heating zone like this, not only influences heats, and water and steam can enter in the tempering load coil, influences the work-ing life of load coil.
Summary of the invention
The objective of the invention is to defective, propose a kind of with steel pipe, oil well pipe and the drilling rod Frequency Induction Heating heat treatment system of Frequency Induction Heating as the thermal treatment heating power supply at above-mentioned existence.
Technical solution of the present invention: its structure is workpiece storing platform, the automatic positioned in alignment device of workpiece, the heating roller-way that quenches, quenching induction heater, double color infrared temperature measuring instrument, spraying and quenching device, workpiece water leaching table, tempering heating roller-way, tempering induction heater, infrared measurement of temperature controller, descaling device, cold bed are connected in series successively, wherein the output terminal of first, second transmitter in the workpiece storing platform, input terminus import with first of electrical apparatus control system/go out to hold corresponding joining; The input terminus of first mechanical manipulator in the automatic positioned in alignment device of workpiece, the output terminal of the 3rd transmitter export with second of electrical apparatus control system/go into to hold corresponding joining; The output terminal of input terminus, four-sensor of second mechanical manipulator in the heating roller-way of quenching exports with the 3rd of electrical apparatus control system/goes into to hold corresponding joining, and the output terminal of the 5th transmitter joins with the first input end of electrical apparatus control system is corresponding; Corresponding the joining of second input terminus of the output terminal in the double color infrared temperature measuring instrument and electrical apparatus control system; In the spraying and quenching device output terminal of the input terminus of the 6th transmitter, the 7th transmitter export with the 4th of electrical apparatus control system/go into to hold corresponding joining; The input terminus of the 3rd mechanical manipulator in the workpiece water leaching table, the output terminal of the 8th transmitter export with the 5th of electrical apparatus control system/go into to hold corresponding joining, and the output terminal of the input terminus of the 4th mechanical manipulator, the 9th transmitter exports with the 6th of electrical apparatus control system/goes into to hold corresponding joining; The output terminal of the tenth transmitter of tempering heating roller-way, the input terminus of the 11 transmitter import with the 7th of electrical apparatus control system/go out to hold corresponding joining; Corresponding the joining of the 3rd input terminus of the output terminal in the infrared measurement of temperature controller and electrical apparatus control system; The input terminus of the 5th mechanical manipulator in the cold bed, the output terminal of the 12 transmitter export with the 8th of electrical apparatus control system/go into to hold corresponding joining.
Advantage of the present invention: heat the thermal source environmentally safe with Frequency Induction Heating as thermal treatment, safety, oxide skin is few, and cost is low.Used equipment heating roller-way can effectively guarantee workpiece homogeneous heating in heat-treatment process, and the workpiece after the heating need not the straightener alignment through behind this roller-way, has reduced production cost.Spraying and quenching device makes workpiece evenly through hardening fully rapidly in the spray continuously with line, and descaling device makes finished product workpiece surface light reach true qualities.Water leaching table, make the workpiece automatic shifting, make workpiece on water leaching table during automatic shifting, ponding emptying in will behind spray quench, managing, can not bring to the tempering heating zone, not only do not influence heats, and water and steam can not enter in the tempering load coil yet, not have the work-ing life that influences load coil.
Description of drawings
Accompanying drawing 1 is a structural representation of the present invention.
Among the figure 1 is workpiece storing platform, the 2nd, the automatic positioned in alignment device of workpiece, the 3rd, the heating roller-way, the 4th that quenches, quenching induction heater, the 5th, double color infrared temperature measuring instrument, the 6th, spraying and quenching device, the 7th, workpiece water leaching table, the 8th, tempering heating roller-way, the 9th, tempering induction heater, the 10th, infrared measurement of temperature controller, the 11st, descaling device, the 12nd, cold bed.
Embodiment
Contrast accompanying drawing 1, its structure is workpiece storing platform 1, the automatic positioned in alignment device 2 of workpiece, the heating roller-way 3 that quenches, quenching induction heater 4, double color infrared temperature measuring instrument 5, spraying and quenching device 6, workpiece water leaching table 7, tempering heating roller-way 8, tempering induction heater 9, infrared measurement of temperature controller 10, descaling device 11, cold bed 12 are connected in series successively, wherein the output terminal of first, second transmitter in the workpiece storing platform 1, input terminus import with first of electrical apparatus control system/go out to hold corresponding joining; The input terminus of first mechanical manipulator in the automatic positioned in alignment device 2 of workpiece, the output terminal of the 3rd transmitter export with second of electrical apparatus control system/go into to hold corresponding joining; The output terminal of input terminus, four-sensor of second mechanical manipulator in the heating roller-way 3 of quenching exports with the 3rd of electrical apparatus control system/goes into to hold corresponding joining, and the output terminal of the 5th transmitter joins with the first input end of electrical apparatus control system is corresponding; Corresponding the joining of second input terminus of the output terminal in the double color infrared temperature measuring instrument 5 and electrical apparatus control system; In the spraying and quenching device 6 output terminal of the input terminus of the 6th transmitter, the 7th transmitter export with the 4th of electrical apparatus control system/go into to hold corresponding joining; The input terminus of the 3rd mechanical manipulator in the workpiece water leaching table 7, the output terminal of the 8th transmitter export with the 5th of electrical apparatus control system/go into to hold corresponding joining, and the output terminal of the input terminus of the 4th mechanical manipulator, the 9th transmitter exports with the 6th of electrical apparatus control system/goes into to hold corresponding joining; The output terminal of the tenth transmitter of tempering heating roller-way 8, the input terminus of the 11 transmitter import with the 7th of electrical apparatus control system/go out to hold corresponding joining; Corresponding the joining of the 3rd input terminus of the output terminal in the infrared measurement of temperature controller 10 and electrical apparatus control system; The input terminus of the 5th mechanical manipulator in the cold bed 12, the output terminal of the 12 transmitter export with the 8th of electrical apparatus control system/go into to hold corresponding joining.Described transmitter adopts high temperature resistant proximity transducer (model Y3-D50C1).
Workpiece storing platform: be contained in first, second transmitter on the storing platform, the signal of gathering is inserted electrical apparatus control system first signal input part corresponding with it, second signal input terminus by its first, second output terminal, after the electrical apparatus control system signal processing, the material loading signal by the signal input part in the output terminal access warning device of electrical apparatus control system, is sent sound, light notice material loading; Electrical apparatus control system inserts the input terminus of first mechanical manipulator on the workpiece alignment station by its output terminal, send null signals by first mechanical manipulator, this null signals treats that electrical apparatus control system sends the material loading signal, sends the material loading signal by first mechanical manipulator of electrical apparatus control system on the alignment station;
Transmitter in the automatic positioned in alignment device of workpiece will have the signal of workpiece material to insert electrical apparatus control system by its output terminal, after the electrical apparatus control system signal processing, the material loading signal is inserted the input terminus of the automatic positioned in alignment device of workpiece by the electrical apparatus control system signal output part, send the material loading signal, prepare for whether next step enters the heating roller-way;
The heating roller-way quenches: workpiece drives running roller forward by the speed control by frequency variation machine, leave the material loading position, transmitter on the heating roller-way inserts electrical apparatus control system with the signal that workpiece leaves the material loading position, after the electrical apparatus control system signal processing, the material loading signal inserts the input terminus of the mechanical manipulator in the heating roller-way by electrical apparatus control system output, and, carry out next workpiece material loading with the material loading signal that above-mentioned alignment means is sent;
The quenching induction heating: workpiece rotation and moving forward on the heating roller-way, the speed that moves enters the electric induced line collar region by the control of speed control by frequency variation machine, and the induction even heating quenches.
The temperature signal that double color infrared temperature measuring instrument is measured inserts electrical apparatus control system by the transmitter output terminal, after the electrical apparatus control system signal processing, the power signal of regulation and control heating in medium frequency power supply inserts the input terminus of heating in medium frequency power supply by electrical apparatus control system output, power by electrical apparatus control system regulation and control heating in medium frequency power supply, make workpiece reach the temperature of technique initialization, form the closed loop thermal Controlling System.
Spraying and quenching device: the workpiece behind the even heating, enter the spraying and quenching device in the spray quench district, carry out quench treatment, make the complete through hardening of workpiece, the workpiece of through hardening enters water leaching table fully.
Residuary water in the workpiece spills outside the workpiece on water leaching table: the transmitter on the draining district roller-way, the signal output that workpiece is put in place inserts electrical apparatus control system, after the electrical apparatus control system signal processing, the signal that workpiece steel pipe or oil well pipe or drilling rod are translated on the water leaching table is exported the input terminus that inserts mechanical manipulator in the draining district by electrical apparatus control system, by mechanical manipulator the workpiece on the draining district roller-way is translated on the water leaching table, stop after several minutes, automatic draining, the residence time is controlled by electrical apparatus control system, workpiece steel pipe or oil well pipe or drilling rod are transported to the signal in tempering line induction heating district by electrical apparatus control system output access mechanical manipulator simultaneously, manipulator behavior is transported to tempering line induction heating district with workpiece steel pipe or oil well pipe or drilling rod.
Tempering heating roller-way: enter workpiece steel pipe on the tempering induction heating district roller-way or oil well pipe or drilling rod rotation on roller-way and move forward, enter tempering heating in medium frequency coil and carry out the tempering heating.
Infrared measurement of temperature control ceremony: double color infrared temperature measuring instrument is measured temperature signal insert electrical apparatus control system by transmitter output, after the electrical apparatus control system signal processing, the power output signal of regulation and control intermediate frequency power supply is inserted the input terminus of intermediate frequency power supply by electrical apparatus control system output, the closed loop temp testing controlling system is formed in the power output of regulation and control intermediate frequency power supply.
Descaling device, the oxide skin of removing workpiece surface; Workpiece steel pipe after the tempered heating or oil well pipe or drilling rod are transported to the de-scaling station by roller-way, carry out de-scaling by the descaling device on the de-scaling station, remove the oxide compound of workpiece surface.
Cold bed: the workpiece after the de-scaling enters the cold bed station, workpiece steel pipe or oil well pipe or the drilling rod signal output that enters cold bed station of transmitter on this cold bed station district roller-way after with de-scaling inserts electrical apparatus control system, through the electrical apparatus control system signal processing, the signal that workpiece steel pipe on the roller-way or oil well pipe or drilling rod are turned on the cold bed inserts the input terminus of the 5th mechanical manipulator by electrical apparatus control system output, and the 5th mechanical manipulator is turned to the workpiece steel pipe on the roller-way or oil well pipe or drilling rod on the cold bed.
The storing platform is the oblique skeleton construction of 2～5 ° of gradients, workpiece steel pipe or oil well pipe or drilling rod roll on the surface-mounted beam that noise resistance nylon backing plate arranged, the exit end design has stop gauge, the manually auxiliary workpiece steel pipe or oil well pipe or drilling rod proper alignment of can making easily distributes when overhead traveling crane hangs material, storing platform stop gauge is an eccentric wheel structure, adjust eccentric wheel in the different angles position for φ 60～φ 139.7, make turn-down rig can only turn over a material at every turn.
Workpiece steel pipe or oil well pipe or drilling rod enter the heating roller-way, and the structure of heating roller-way is that the heating roller-way is installed on the roller bed frame, the downward-sloping in the horizontal direction 0.3-1 degree of heating roller-way; Install on the heating roller-way several V-type running rollers with the step-down gear of the band frequency control motor of the corresponding setting of V-type running roller, between V-type running roller and V-type running roller load coil is set, workpiece steel pipe or oil well pipe or drilling rod are placed on the V-type running roller, between the axis direction of the rolling axle of V-type running roller and steel pipe or oil well pipe or drilling rod inclination 8-20 °.
The frequency conversion feeder is single roller transmission, and adjustable-speed V-type running roller is the roller feed machine of inclination 8-20 ° layout, have straight feeding correction in and the function of workpiece steel pipe or oil well pipe or drilling rod rotation.Wherein between the heater coil and the feed rolls of import and export be heat-resistance stainless steel, all the other are wear resisting steel.It is downward-sloping that the roller-way of quenching heating zone has been mounted to 0.3-1 degree, and the aqueous reflux when this can prevent to quench in residual steel pipe or oil well pipe or the drilling rod is to the quenching heating zone.
Variable frequency heating power supply, induction heating electric furnace and double color infrared temperature measuring instrument detect workpiece steel pipe or oil well pipe or drilling rod temperature and feed back to intermediate frequency power supply forms closed loop control system.Heating temperature 850-1000 ℃.
Power supply water coolant, distilled water water temperature≤35 ℃ pressure 0.2～0.35MPa
Matching board formula interchanger.
1 of double color infrared temperature measuring instrument is installed in last load coil rear portion and detects workpiece temperature and feed back to intermediate frequency power supply composition closed loop control system.
Workpiece steel pipe or oil well pipe or drilling rod are being heated to about 850 ℃～1000 ℃ through ruhmkorff coil to 5～10 meters/minute speed about by 20 meters/minute on the heat-treatment production line, continuously make the evenly through hardening fully fast of workpiece steel pipe or oil well pipe or drilling rod by the quench spraying and quenching device of system of this spray in second at 5-30, it directly influences the flexural deformation of product and the comprehensive mechanical property of steel pipe.
Described spraying and quenching device, its structure are to comprise spray thrower, water pump, the spray angle regulator of quenching, wherein spray thrower shape ringwise; The water inlet pipe and the water pump of spray thrower join, and spray the angle regulator of quenching and are installed on the spray thrower, and several nozzles are housed on the spray thrower, and the diameter of this nozzle is 1.2-4mm, and the spray configuration of nozzle is cone-shaped or fan shape, and several nozzles are symmetrically arranged; The medullary ray of spraying and quenching device is coaxial with the medullary ray of workpiece steel pipe or oil well pipe or drilling rod.
After quenching, stay water in workpiece steel pipe or oil well pipe or the drilling rod and bring in the tempering coil and set up this station water leaching table in order to remove workpiece steel pipe or oil well pipe or drilling rod, it is long 12 meters, wide 1.2 meters, and tilt, adopting the Pneumatic charging machine that the workpiece steel pipe on the roller-way or oil well pipe or drilling rod are held up is placed on the water leaching table, residuary water in workpiece steel pipe or oil well pipe or the drilling rod is spilt in the pipe, behind the several minutes, lift by the Pneumatic charging machine and to serve on the tempering line roller-way.
Described water leaching table, its structure is made up of some guide rails, non-being arranged in parallel between every guide rail and guide rail, water leaching table is inclination on two directions, one of them direction is that water leaching table is at the axis direction inclination 2-5 of workpiece steel pipe or oil well pipe or drilling rod degree, another direction is to be between every guide rail of water leaching table to intersect to tilt, and the pitch angle is increased between 2-20 degree by root.
Tempering Frequency Induction Heating district variable frequency induction heating power supply, load coil are formed tempering induction heating part and double color infrared temperature measuring instrument closed loop system.(double color infrared temperature measuring instrument adopts double-colored optical fiber infrared thermometer, its model RAYFRIASF001) Heating temperature 500-720 ℃.
Power supply water coolant, distilled water water temperature≤35 ℃ pressure 0.2～0.35MPa
Matching board formula interchanger.
Double color infrared temperature measuring instrument is installed in last cover heater coil rear portion and detects workpiece steel pipe or oil well pipe or drilling rod temperature and feed back to intermediate frequency power supply, forms closed loop control system.
This electrical control system is selected Siemens S7-315/2DP programmable logic controller PLC for use; can realize unit adjustment control, manually control, semiautomatic controls, full automatic control; while is according to the processing requirement of unit; each equipment component on the unit is realized the interlock protection function; the fault-operation protection function; various working ordeies and every equipment component action Presentation Function; S7-315/2DP detects limit switch signal; pressure sensor signal is carried out corresponding processing sequence respectively according to operational order (as various dutys, action button).Because S7-315/2DP has abundant time variable control order, can make Controlling System finish all process control tasks of unit and speed governing positioning function effectively, under automatic mode of operation, as long as satisfying, starting condition presses auto-start button, program is just once finished the needed whole actions of whole unit by the process system of selected (different diameter of steel tube and material), and begins next round-robin sampling action in a loop cycle action on finishing.
Claims (1)
1, Pipe Middle Frequency Induction heat hot treatment system, it is characterized in that workpiece storing platform, the automatic positioned in alignment device of workpiece, the heating roller-way that quenches, quenching induction heater, double color infrared temperature measuring instrument, spraying and quenching device, workpiece water leaching table, tempering heating roller-way, tempering induction heater, infrared measurement of temperature controller, descaling device, cold bed be connected in series successively, wherein the output terminal of first, second transmitter in the workpiece storing platform, input terminus import with first of electrical apparatus control system/go out to hold corresponding joining; The input terminus of first mechanical manipulator in the automatic positioned in alignment device of workpiece, the output terminal of the 3rd transmitter export with second of electrical apparatus control system/go into to hold corresponding joining; The output terminal of input terminus, four-sensor of second mechanical manipulator in the heating roller-way of quenching exports with the 3rd of electrical apparatus control system/goes into to hold corresponding joining, and the output terminal of the 5th transmitter joins with the first input end of electrical apparatus control system is corresponding; Corresponding the joining of second input terminus of the output terminal in the double color infrared temperature measuring instrument and electrical apparatus control system; In the spraying and quenching device output terminal of the input terminus of the 6th transmitter, the 7th transmitter export with the 4th of electrical apparatus control system/go into to hold corresponding joining; The input terminus of the 3rd mechanical manipulator in the workpiece water leaching table, the output terminal of the 8th transmitter export with the 5th of electrical apparatus control system/go into to hold corresponding joining, and the output terminal of the input terminus of the 4th mechanical manipulator, the 9th transmitter exports with the 6th of electrical apparatus control system/goes into to hold corresponding joining; The output terminal of the tenth transmitter of tempering heating roller-way, the input terminus of the 11 transmitter import with the 7th of electrical apparatus control system/go out to hold corresponding joining; Corresponding the joining of the 3rd input terminus of the output terminal in the infrared measurement of temperature controller and electrical apparatus control system; The input terminus of the 5th mechanical manipulator in the cold bed, the output terminal of the 12 transmitter export with the 8th of electrical apparatus control system/go into to hold corresponding joining; Described heating roller-way is installed on the roller bed frame, the downward-sloping in the horizontal direction 0.3-1 degree of heating roller-way; Install on the heating roller-way several V-type running rollers with the step-down gear of the band frequency control motor of the corresponding setting of V-type running roller, between V-type running roller and V-type running roller load coil is set, the workpiece steel pipe is placed on the V-type running roller, between the rolling axle of V-type running roller and the axis direction of steel pipe inclination 8-20 °; Described water leaching table is made up of some guide rails, non-being arranged in parallel between every guide rail and guide rail, water leaching table is inclination on two directions, one of them direction is the axis direction inclination 2-5 degree of workpiece steel pipe on the water leaching table, another direction is to be the intersection inclination between every guide rail on the water leaching table, and the pitch angle is increased between 2-20 degree by root; Described spraying and quenching device comprises spray thrower, water pump, the spray angle regulator of quenching, wherein spray thrower ringwise shape distribute; The water inlet pipe and the water pump of spray thrower join, and spray the angle regulator of quenching and are installed on the spray thrower, and several nozzles are housed on the spray thrower, and the diameter of this nozzle is 1.2-4mm, and the spray configuration of nozzle is cone-shaped and fan shape, and several nozzles are symmetrically arranged; The medullary ray of spraying and quenching device is coaxial with the medullary ray of workpiece steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100247466A CN100500884C (en) | 2007-06-28 | 2007-06-28 | Medium frequency induction heating treatment system for steel pipe, petroleum well pipe and drill pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100247466A CN100500884C (en) | 2007-06-28 | 2007-06-28 | Medium frequency induction heating treatment system for steel pipe, petroleum well pipe and drill pipe |
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| CN101078043A CN101078043A (en) | 2007-11-28 |
| CN100500884C true CN100500884C (en) | 2009-06-17 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101824526B (en) * | 2010-04-23 | 2012-02-22 | 西安长庆石油工具制造有限责任公司 | Medium-frequency heat treatment system and heat treatment process for petroleum tool irregular materials |
| CN101914667B (en) * | 2010-07-27 | 2012-01-04 | 济南沃德汽车零部件有限公司 | Continuous quenching and tempering device for valve rod end |
| CN102002573B (en) * | 2010-09-25 | 2012-10-10 | 朱兴发 | Production line for carrying out quenching and tempering heat treatment on steel rail off-line or on-line railhead tread |
| CN101962711A (en) * | 2010-09-30 | 2011-02-02 | 许昌远东传动轴股份有限公司 | Quenching method of push rod type hardening and tempering production line |
| CN102864293B (en) * | 2011-07-05 | 2014-08-27 | 北京隆盛泰科石油管科技有限公司 | Large-diameter steel pipe on-line bulk heat treatment system |
| CN103725836B (en) * | 2014-01-18 | 2015-09-02 | 双威大昌锻造(安徽)有限公司 | A kind of axle of track section, axle sleeve quenching processing units |
| CN104480266A (en) * | 2014-11-28 | 2015-04-01 | 柳州金茂机械有限公司 | Automated process for wear-resisting knife board production line |
| CN106435144B (en) * | 2016-08-31 | 2018-01-12 | 安吉县鹏大钢管有限公司 | A kind of modifier treatment production line of probing geology steel tube |
| CN106916924A (en) * | 2017-03-20 | 2017-07-04 | 范玫光 | A kind of high-strength steel bar tinuous production |
| CN109929975B (en) * | 2017-12-18 | 2024-03-26 | 上海北特科技股份有限公司 | Blocking material monitoring and removing system and blocking material monitoring and removing method |
| CN113308596A (en) * | 2020-02-27 | 2021-08-27 | 宁波市鄞州风名工业产品设计有限公司 | Vertical quenching device and tempering device |
| CN113621767B (en) * | 2021-08-19 | 2023-04-28 | 十堰高周波科工贸有限公司 | Intelligent heat treatment production line |
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Assignee: Suzhou Zhenwu Electric Furnace Co., Ltd. Assignor: Zhu Xingfa Contract record no.: 2011320010006 Denomination of invention: Medium frequency induction heating treatment system for steel pipe, petroleum well pipe and drill pipe Granted publication date: 20090617 License type: Exclusive License Open date: 20071128 Record date: 20110308 |