CN102094114B - Energy-saving gas conditioning furnace and thermal processing method for hot rolling of seamless steel pipes - Google Patents
Energy-saving gas conditioning furnace and thermal processing method for hot rolling of seamless steel pipes Download PDFInfo
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- CN102094114B CN102094114B CN 200910255626 CN200910255626A CN102094114B CN 102094114 B CN102094114 B CN 102094114B CN 200910255626 CN200910255626 CN 200910255626 CN 200910255626 A CN200910255626 A CN 200910255626A CN 102094114 B CN102094114 B CN 102094114B
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Abstract
The invention relates to an energy-saving gas conditioning furnace and thermal processing method for the hot rolling of seamless steel pipes, which belongs to the field of thermal processing of seamless steel pipes and specifically relates to a gas conditioning furnace and process capable of implementing quenching and tempering processes of seamless steel pipes. The gas conditioning furnace comprises a kiln body (11) and a roller way transmission part, and is characterized in that the front end of the kiln body (11) is provided with an automatic feeding device (5), both sides of the kiln body (11) are respectively provided with the roller way transmission part and a temperature control device, and an electrical control device is arranged outside the kiln body (11). The method comprises the following steps: moving seamless steel pipes into the kiln body (11) by means of the automatic feeding device (5), gradually and sufficiently heating in the kiln body (11), quickly moving the seamless steel pipes (9) into a straightener by means of a quick transmission device, and performing straightening and quenching procedures. By adopting gas heating, electric power consumption is reduced, so that the production scale can be expanded; the kiln body ensures that the seamless steel pipes can be sufficiently and uniformly heated in the kiln body; the seamless steel pipes can be quickly discharged from the kiln body by the quick transmission device, thereby satisfying the optimal temperature required for the quenching and tempering processes; and the invention has the advantages of short average time for finishing the conditioning process, low cost and the like.
Description
Technical field
Energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace and heat treating method belong to the weldless steel tube Field of Heat-treatment, are specifically related to a kind of combustion gas quenching and tempering device and technique that realizes weldless steel tube quenching, tempering process.
Background technology
Do not change the shape of weldless steel tube, and by quenching and mechanical property, physicals, the chemical property of tempering heat treatment process change weldless steel tube, namely improve intensity and the toughness of weldless steel tube, reach the use properties of expection, this technique quenching and tempering combination is referred to as modified, and box-type furnace or intermediate frequency furnace are used in the enforcement of this technique usually.The box-type furnace heating is inhomogeneous, the two ends temperature that is weldless steel tube is low, and medium temperature is high, thereby the high-temperature-phase that steel tube place obtains is inconsistent, causes modified effect bad, and needs the blow-on single-piece to take out during quench treatment, cause temperature reduction in the box-type furnace, must reheat, the intermittent time is long, and the accumulation of heat loss is large.Box-type furnace also can not be realized tempering process, need set up separately tempering stove.Realizing quenching must increase electric power with tempering, be unfavorable for expanding the scale of production, and the intermediate frequency furnace cost of investment is too high.To sum up there are the following problems for the constructional feature of two kinds of stoves:
1, heating is inhomogeneous, and modified effect is bad;
2, the intermittent time long, efficient is low, power consumption penalty is large;
3, electric power is large, is unfavorable for expanding the scale of production;
4, production cost is too high.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provide a kind of modified effective, low in energy consumption, efficient is high, cost is low, integrates the energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace and the heat treating method that quench with tempering.
The technical solution adopted for the present invention to solve the technical problems is: this energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace, comprise kiln body, roller-way driving part, it is characterized in that: kiln body front end arranges automatic feeder, roller-way driving part and temperature control unit are installed in kiln body both sides, and are installed in the external electrical control gear of kiln.
Described kiln body is followed successively by preheating zone, heating zone, high-temperature zone along being fed to the discharging direction, at front bottom end and the top of preheating zone flue and chimney is set respectively, is the kiln body passage of charging in the middle of the kiln body.
Described roller-way driving part comprise be installed in kiln body two ends be connected with kiln body inside live roll, live roll two ends protrude from an end outer most bits that kiln body below arranges steady bearing, live roll install sprocket wheel, is connected with sprocket wheel soon at a slow speed principal and subordinate's movable sprocket, be connected and fixed soon the at a slow speed transmission shaft of principal and subordinate's movable sprocket, the axle bed of fixed conveyor axle is installed in the at a slow speed transmission mechanism of kiln body head end and the fast driving device of kiln body end.
Described at a slow speed transmission mechanism comprises at a slow speed live roll chain, slow speed motor, the second step-down gear, the first drive sprocket, the first active chain, the second drive sprocket, second driving shaft, the second axle bed, the second support and the first driven sprocket, slow speed motor is installed in the at a slow speed front end of transmission mechanism, the second step-down gear is installed on the slow speed motor, the first drive sprocket is installed on the second step-down gear, the second drive sprocket above initiatively chain is connected on by first, the second drive sprocket is connected in an end of second driving shaft, second driving shaft is installed on the second axle bed, the second axle bed is fixed on the second support of below, the other end of second driving shaft is installed the first driven sprocket, at a slow speed live roll chain is installed on the first driven sprocket, the sprocket wheel below links at a slow speed live roll chain, and the below of live roll chain arranges the chain holder at a slow speed.The height of chain holder can be by the adjustment bolt adjustment on the angle steel of being fixed on of its below, and the degree of tightness of live roll chain can be adjusted by the chain regulating wheel that is fixed on the angle bar frame below at a slow speed.
Described fast driving device comprises quick live roll chain, quick motor, the 3rd step-down gear, the 4th drive sprocket, the second active chain, the 3rd drive sprocket, the first transmission shaft, the first axle bed, the first support and the 4th driven sprocket, hydraulic top, hydraulic top support and travel switch, motor is installed in the end of fast driving device fast, on the motor the 3rd step-down gear is installed fast, the 4th drive sprocket is installed on the 3rd step-down gear, the 3rd drive sprocket above initiatively chain is connected on by second, the 3rd drive sprocket is connected in an end of the first transmission shaft, the first transmission shaft is installed on the first axle bed, the first axle bed is fixed on the first support of below, the other end of the first transmission shaft is installed the 4th driven sprocket, quick live roll chain is installed on the 4th driven sprocket, the below of sprocket wheel links quick live roll chain, the below of live roll chain arranges the chain holder fast, the height of chain holder can be by the adjustment bolt adjustment on the angle steel of being fixed on of its below, the degree of tightness of live roll chain can be adjusted by the chain regulating wheel that is fixed on the angle bar frame below fast, hydraulic top is installed in the terminal below of fast driving device, one side of hydraulic top support is fixed on the angle steel of kiln body one side, and travel switch is installed on the crossbeam in the middle of the least significant end of fast driving device.
Described automatic feeder comprises feeding table, and feeding table is for tilt installing, and the feeding table bottom arranges the weldless steel tube piece of limiting the quantity of, and thruster is set below the panel of feeding table, and roller-way driving part top in feeding table the place ahead arranges the weldless steel tube stopper slot.Weldless steel tube is boosted by thruster and crosses weldless steel tube and limit the quantity of on the live roll of the next door roller-way driving part that drops on the weldless steel tube stopper slot behind the piece, at the uniform velocity moves forward.
Described temperature control unit comprises thermopair and fuel burner nozzle, and position, upper middle, kiln body both sides arranges thermopair, and the below of kiln body both sides live roll arranges the fuel burner nozzle that a plurality of spacings are successively decreased, and is interspersed in kiln body both sides.Thermopair can be measured temperature in the kiln body, utilizes gas quantity and then control temperature in the fuel burner nozzle control kiln body.
Described electric control system comprises limit switch, travel switch, limit switch is installed on the weldless steel tube stopper slot of automatic feeder, by the work of open and close mode control thruster, travel switch is installed in the fast driving device end, works by open and close mode control hydraulic top.
Live roll is by the uniform rotation on steady bearing of live roll chain, and the live roll of roller-way driving part front end is to slowly run, terminal live roll twirl, weldless steel tube moves at a slow speed first forward rear rapid moving kiln discharge body and contacts with the travel switch of roller-way driving part end on live roll, travel switch rises rapidly hydraulic top and weldless steel tube is sent, cause quenching to reduce temperature decrease untimely, modified effect is undesirable.
A kind of hardening and tempering furnace of claim 1 that utilizes is characterized in that the heat treating method of hot rolled seamless steel tube: quench first, after carry out tempering, step is as follows:
Quench:
1.1 blowing is with neat being emitted on the automatic feeder of pending heat treated weldless steel tube;
1.2, automatic feed, start that the weldless steel tube on the automatic feeder is admitted in the hardening and tempering furnace in order at regular intervals one by one behind the power supply;
1.3, preheating, weldless steel tube vertically enters the preheating zone of hardening and tempering furnace, and moves forward with the speed of 0.255m/min, through the thermal pretreatment of 20min time;
1.4, heating, after weldless steel tube is through the preheating zone preheating, enter the hardening and tempering furnace temperature and be 300 ℃ heating zone, weldless steel tube continues to move forward, the heating through the 10min time makes weldless steel tube obtain uniform temperature;
1.5, high temperature, when weldless steel tube through after the heating zone heating, enter the hardening and tempering furnace temperature and be 920 ℃ high-temperature zone, weldless steel tube continues to move forward, after the high temperature intensification through the 8min time, the temperature of weldless steel tube remains on 920 ℃ uniformly, arrives on the fast driving device;
1.6, quick tapping, when the temperature of weldless steel tube reaches tapping temperature (920 ℃), for the minimizing time of coming out of the stove prevents that its temperature from descending suddenly, end at hardening and tempering furnace arranges fast driving device, when weldless steel tube arrives fast driving device, its front line speed is promoted to 6m/min by original 0.255m/min, and 12 seconds left and right sides quick tappings of weldless steel tube arrive subsequent processing;
1.7, alignment, the weldless steel tube about 920 ℃ is sent to automatically to carry out alignment and processes in the straightener, finish through about 3 seconds;
1.8, water-cooled, after alignment was finished in a upper operation, the water source on the straightener then carries out spray quenching to weldless steel tube to be processed, and the temperature of weldless steel tube is dropped to rapidly below 300 ℃, finishes quenching process.
Tempering:
2.1, blowing, pending weldless steel tube neatly is emitted on the automatic feeder.
2.2, automatic feed, start that the weldless steel tube on the automatic feeder is admitted in the hardening and tempering furnace in order at regular intervals one by one behind the power supply.
2.3, preheating, weldless steel tube enters the preheating zone of hardening and tempering furnace, with the reach of the speed of 0.255m/min, moving forward the middle time through 20min carries out preheating procedure and processes.
2.4, heating, after weldless steel tube is through the preheating zone preheating, enter the hardening and tempering furnace temperature and be 300 ℃ heating zone, weldless steel tube continues to move forward, the heating through the 10min time makes weldless steel tube obtain uniform temperature.
2.5, high temperature, when weldless steel tube through after the heating zone heating, enter the hardening and tempering furnace temperature and be 550 ℃ high-temperature zone, weldless steel tube continues to move forward, after the high temperature intensification through the 8min time, the temperature of weldless steel tube remains on 550 ℃ uniformly, arrives on the fast driving device.
2.6, quick tapping, when the temperature of weldless steel tube reaches tapping temperature (550 ℃), for the minimizing time of coming out of the stove prevents that its temperature from descending suddenly, end at hardening and tempering furnace arranges fast driving device, when weldless steel tube arrives fast driving device, its front line speed is promoted to 6m/min by original 0.255m/min, and 12 seconds left and right sides quick tappings of weldless steel tube arrive subsequent processing.
2.7, air cooling, the weldless steel tube behind the quick tapping is placed in the air naturally cooling and finished drawing process to normal temperature in 4～5 hours.
Compared with prior art, the beneficial effect that has of the energy-saving hot rolled seamless steel tube combustion gas of the present invention hardening and tempering furnace is:
Hardening and tempering furnace is owing to adopting rollaway type, and steel pipe is to roll with uniform acceleration to advance through cold zone → preheating zone → high-temperature zone, is homogeneous heating to steel pipe, and thermal effectiveness is good; 360 of the high every daily outputs of hardening and tempering furnace output, and 136 of box-type furnace daily outputs, output increased 3 times; The hardening and tempering furnace overall investment is less than 20,000 yuan, and the intermediate frequency furnace overall investment always needs more than 80 ten thousand yuan, and every tooling cost of hardening and tempering furnace is 7 yuan, and the every steel pipe of intermediate frequency furnace is 13.2 yuan, and by contrast, hardening and tempering furnace is superior to intermediate frequency furnace.Hardening and tempering furnace and box-type furnace, the intermediate frequency furnace contrast sees Table 1.
Table 1 hardening and tempering furnace and box-type furnace intermediate frequency furnace contrast table
1, this energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace adopts gas heating to reduce electrical power consumed, can expand the scale of production;
2, this energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace can satisfy the temperature required with tempering process of quenching;
3, that weldless steel tube is heated in the kiln body is full and uniform the preheating zone of kiln body, heating zone and high-temperature zone, and heat energy utilization is abundant;
4, fast driving device is with the kiln discharge body fast with weldless steel tube, and it is best that the temperature in the time of making quenching, tempering keeps;
5, it is shorter that every weldless steel tube is finished modified used mean time, and efficient is high, cost is low.
Description of drawings
Fig. 1 is the energy-saving hot rolled seamless steel tube combustion gas of the present invention hardening and tempering furnace master TV structure schematic diagram.
Fig. 2 is Fig. 1 plan structure schematic diagram.
Fig. 3 is that Figure 1B is to automatic feeder master TV structure schematic diagram.
Fig. 4 is Fig. 3 plan structure schematic diagram.
Fig. 5 is Fig. 2 D place enlarged diagram.
Fig. 6 is Figure 1A-A sectional structure schematic diagram.
Fig. 7 is Fig. 1 C place enlarged diagram.
Fig. 8 is the schema of the heat treating method of hot rolled seamless steel tube of the present invention.
Fig. 1～8th, most preferred embodiment of the present invention.Wherein: 1, the second drive sprocket 2, the live roll chain 3 at a slow speed, sprocket wheel 4, weldless steel tube stopper slot 5, automatic feeder 6, chimney 7, chimney switch 8, live roll 9, weldless steel tube 10, heating zone thermopair 11, kiln body 12, travel switch 13, crossbeam 14, the 3rd drive sprocket 15, the first support 16, the second active chain 17, the 3rd step-down gear 18, quick motor 19, hydraulic top 20, hydraulic top support 21, quick live roll chain 22, chain regulating wheel 23, high-temperature zone combustion gas mouth 24, high-temperature zone 25, heating zone 26, heating zone combustion gas mouth 27, preheating zone 28, slow speed motor 29, the second step-down gear 30, the first active chain 31, the second support 32, limit switch 33, high-temperature zone thermopair 34, angle steel 35, the 4th driven sprocket 36, the first transmission shaft 37, the first axle bed 38, the 4th drive sprocket 39, flue 40, the first drive sprocket 41, the second axle bed 42, second driving shaft 43, the first driven sprocket 44, stopper slot carriage 45, the weldless steel tube piece 46 of limiting the quantity of, weldless steel tube push pedal 47, column 48, feeding table panel 49, the first step-down gear 50, eccentric wheel 51, angle bar frame 52, connecting rod 53, thruster motor 54, steady bearing 55, anti-vibration ring 56, the 3rd driven sprocket 57, the 3rd support 58, the 3rd transmission shaft 59, the 3rd axle bed 60, transmission shaft 61, the 4th axle bed 62, the second driven sprocket 63, kiln body passage 64, perforated brick 65, adjust bolt 66, the chain holder.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing 1～8:
Shown in Fig. 1～8:
Energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace of the present invention mainly comprises kiln body 11, roller-way driving part, automatic feeder 5, temperature control unit, fast driving device, electric control system.
Shown in Fig. 1～2:
The roller-way driving part is installed in its two ends, both sides of kiln body 11 and stretches out kiln body 11, comprises live roll 8, sprocket wheel 3, steady bearing 54, anti-vibration ring 55, angle steel 34, angle bar frame 51, adjusts bolt 65, chain holder 66, chain regulating wheel 22, principal and subordinate's movable sprocket, transmission shaft, axle bed, at a slow speed transmission mechanism, fast driving device.
The front end below of roller-way driving part arranges at a slow speed transmission mechanism, transmission mechanism comprises at a slow speed live roll chain 2 at a slow speed, slow speed motor 28, the second step-down gear 29, the first drive sprocket 40, the first active chain 30, the second drive sprocket 1, second driving shaft 42, the second axle bed 41, the second support 31 and the first driven sprocket 43, the front end of transmission mechanism arranges slow speed motor 28 at a slow speed, the second step-down gear 29 is installed on the slow speed motor 28, the first drive sprocket 40 is installed on the second step-down gear 29, the second drive sprocket 1 above initiatively chain 30 is connected on by first, the second drive sprocket 1 is connected in an end of second driving shaft 42, second driving shaft 42 is installed on the second axle bed 41, the second axle bed 41 is fixed on the second support 31 of below, the other end of second driving shaft 42 is installed the first driven sprocket 43, at a slow speed live roll chain 2 is installed on the first driven sprocket 43, sprocket wheel 3 belows link at a slow speed live roll chain 2, the below of live roll chain 2 arranges chain holder 66 at a slow speed, the height of chain holder 66 can be adjusted by the adjustment bolt 65 that is fixed on the angle steel 34 of its below, and the degree of tightness of live roll chain 2 can be adjusted by the chain regulating wheel 22 that is fixed on angle bar frame 51 belows at a slow speed.
The terminal below of roller-way driving part arranges fast driving device, fast driving device comprises quick live roll chain 21, quick motor 18, the 3rd step-down gear 17, the 4th drive sprocket 38, the second active chain 16, the 3rd drive sprocket 14, the first transmission shaft 36, the first axle bed 37, the first support 15 and the 4th driven sprocket 35, hydraulic top 19, hydraulic top support 20, travel switch 12, the end of fast driving device arranges quick motor 18, on the motor 18 the 3rd step-down gear 17 is installed fast, the 4th drive sprocket 38 is installed on the 3rd step-down gear 17, the 3rd drive sprocket 14 above initiatively chain 16 is connected on by second, the 3rd drive sprocket 14 is connected in an end of the first transmission shaft 36, the first transmission shaft 36 is installed on the first axle bed 37, the first axle bed 37 is fixed on the first support 15 of below, the other end of the first transmission shaft 36 is installed the 4th driven sprocket 35, quick live roll chain 21 is installed on the 4th driven sprocket 35, the below of sprocket wheel 3 links quick live roll chain 21, the below of live roll chain 21 arranges chain holder 66 fast, the height of chain holder 66 can be adjusted by the adjustment bolt 65 that is fixed on the angle steel 34 of its below, the degree of tightness of live roll chain 21 can be adjusted by the chain regulating wheel 22 that is fixed on angle bar frame 51 belows fast, the terminal below of fast driving device arranges hydraulic top 19, hydraulic top support 20 is fixed on the angle steel 34 of kiln body 11 1 sides and acts on the hydraulic top 19, the travel switch 12 that arranges in the middle of the least significant end of fast driving device, travel switch 12 is fixed on the crossbeam 13 of fast driving device end.
Shown in Fig. 3～4:
The automatic feeder 5 vertical with kiln body 11 length directions is set between the feed end of kiln body 11 and the roller-way driving part front end, automatic feeder 5 comprises feeding table, thruster, weldless steel tube stopper slot 4, feeding table comprises feeding table panel 48, column 47, the weldless steel tube piece 45 of limiting the quantity of, feeding table panel 48 is panel that tilt and bottom opening, feeding table panel 48 bottoms are fixing by column 47, and the bottom of the bottom square hole of feeding table panel 48 is the weldless steel tube piece 45 of limiting the quantity of fixedly.Thruster comprises thruster motor 53, the first step-down gear 49, eccentric wheel 50, connecting rod 52, weldless steel tube push pedal 46, the below of feeding table panel 48 arranges thruster motor 53, the first step-down gear 49 is installed on the thruster motor 53, setting-up eccentricity wheel 50 on the first step-down gear 49, the connecting rod 52 that can move up and down is installed on the eccentric wheel 50, connecting rod 52 terminal fixedly weldless steel tube push pedals 46, weldless steel tube push pedal 46 moves up and down by the feeding table panel 48 of bottom with square hole.Weldless steel tube stopper slot 4 is positioned at 63 mouthfuls of the place aheads of kiln body passage of kiln body 11, and directly over the live roll 8 of roller-way driving part, weldless steel tube stopper slot 4 is near an end mounting limit switch 32 of kiln bodies 11.
Shown in Fig. 1～2:
The both sides of kiln body arrange temperature control unit, comprise thermopair and fuel burner nozzle, heating zone 25 and position, upper middle, 24 both sides, high-temperature zone at the kiln body arrange respectively heating zone thermopair 10 and high-temperature zone thermopair 33, the below of kiln body both sides live roll 8 arranges respectively heating zone fuel burner nozzle 26 and high-temperature zone fuel burner nozzle 23, from the heating zone 25 to the high-temperature zone 24 direction fuel burner nozzle spacing tapers off and is staggered distribution in kiln body 11 both sides.
The heat treatment process of weldless steel tube in hardening and tempering furnace is as follows: on the feeding table that is emitted on automatic feeder 5 that weldless steel tube is neat, open the chimney switch 7 on the chimney 6, increase the natural draft of flue 39, open heating zone fuel burner nozzle 26 and high-temperature zone fuel burner nozzle 23, and regulate respectively flame size, high-temperature gas after the burning gives off outdoor along kiln body passage 65 is guided to the flue 39 of preheating zone 27 by the natural draft of chimney 6 from high-temperature zone 24 and heating zone 25, wait for when temperature that heating zone thermopair 10 and high-temperature zone thermopair 33 detect arrives respectively 300 ℃ and 920 ℃ plugged unlatching roller-way driving part and automatic feeder 5.
Automatic feeder 5 is started working, thruster motor 53 under the feeding table panel 48 drives 49 work of the first step-down gear, eccentric wheel 50 on the first step-down gear 49 rotates, and then drivening rod 52 moves up and down, the weldless steel tube push pedal 46 that is connected on the connecting rod 52 boosts the weldless steel tube 9 above it, the weldless steel tube that weldless steel tube 9 is crossed feeding table panel 48 bottoms is limited the quantity of and is entered on the live roll 8 that is rotating in the roller-way driving part behind the piece 45, weldless steel tube 9 is blocked by weldless steel tube stopper slot 4, and beginning is moved in kiln body 11.Meanwhile weldless steel tube push pedal 46 repositions, another part weldless steel tube 9 is rolled into down again the top of weldless steel tube push pedal 46, obtain the limit switch 32 on the proal weldless steel tube 9 contact weldless steel tube stopper slots 4, so that thruster motor 53 has a power failure, eccentric wheel 50 stops operating, until on the live roll 8 of weldless steel tube 9 at the roller-way driving part with the speed of 0.255m/min after linear uniform motion to integral body enters kiln body 11 forward, limit switch 32 resets, thruster motor 53 gets electric, repeats above automatic feed process.
On the live roll 8 of the at a slow speed transmission mechanism of weldless steel tube 9 arrival roller-way driving part one by one, the two ends slow speed motor 28 of roller-way driving part is all started working with quick motor 18.Slow speed motor 28 drives 29 work of the second step-down gear, drive the first initiatively chain 30 motions by the first drive sprocket 40 on the second step-down gear 29, first initiatively chain 30 drives the second drive sprocket 1 rotation, the second drive sprocket 1 drives second driving shaft 42 and rotates, second driving shaft 42 drives the first driven sprocket 43 and rotates, and then drive the at a slow speed motion of live roll chain 2, live roll chain 2 is in chain holder 66 motions and with it sprocket wheel 3 rotations of link of drive at a slow speed, and then drive all live rolls 8 of linking with live roll chain 2 at a slow speed in steady bearing 54 rotations, and maintenance horizontal linear velocity 0.255m/min uniform rotation, to obtain speed of relative movement 0.255m/min at the uniform velocity mobile forward by the friction that contacts with live roll 8 for weldless steel tube 9, weldless steel tube 9 enters in the preheating zone 27 of kiln body 11, arrive temperature the warm up time of experiencing altogether 20min and be 300 ℃ heating zone 25, speed remains unchanged, weldless steel tube 9 arrival temperature are 920 ℃ high-temperature zone 24 after the heating of heating zone 25 experience 10min, speed remains unchanged, the fast driving device head end that weldless steel tube 9 arrives in the kiln body 11 after the heat of high-temperature zone 24 experience 8min.
Motor 18 drives 17 work of the 3rd step-down gear fast, the 4th drive sprocket 38 on the 3rd step-down gear 17 rotates, and then by the second initiatively chain 16 drives the 3rd drive sprocket 14 rotations, take out 36 through the first transmission and drive 35 rotations of the 4th driven sprocket, drive live roll 8 speed twirl with horizontal linear velocity 6m/min on steady bearing 54 by quick live roll chain 21 and sprocket wheel 3, the speed of weldless steel tube 9 acquisition 6m/min travels forward simultaneously, shifted out kiln body 11 fully through 12 seconds, and by the travel switch 12 on the contact fast driving device end beams 13, triggering hydraulic top 19 starts, hydraulic top support 20 rises rapidly, weldless steel tube 9 rolls into subsequent processing alignment and quenching along the hydraulic top support 20 under the heeling condition, travel switch 12 resets simultaneously, and hydraulic top support 20 falls return.
Undertaken by the quenching process step equally during tempering, the temperature to 550 ℃ that different is regulates kiln body 11 interior high-temperature zones 24, so that weldless steel tube 9 thermally equivalents obtain this temperature, carry out quick tapping and be placed in the air self-heating cooling 4～5 hours to normal temperature, finish the tempering whole process.
Weldless steel tube is heated evenly by the heating of combustion gas hardening and tempering furnace, and fast driving device can make weldless steel tube obtain desirable quenching and tempering temperature, has reached the requirement of expection use properties.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (7)
1. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace, comprise kiln body (11), roller-way driving part, it is characterized in that: kiln body (11) front end arranges automatic feeder (5), roller-way driving part and temperature control unit are installed in kiln body (11) both sides, and are installed in the outer electrical control gear of kiln body (11); Described kiln body (11) is followed successively by preheating zone (27), heating zone (25), high-temperature zone (24) along being fed to the discharging direction, the front bottom end of (27) and top arrange respectively flue (39) and chimney (6) in the preheating zone, are the kiln body passage (63) of charging in the middle of the kiln body (11);
Described roller-way driving part comprise be installed in kiln body (11) two ends and be connected 11 with the kiln body) below that protrudes from the live roll (8) of kiln body (11) both sides, inner live roll (8), two ends an end outer most bits that steady bearing (54), live roll (8) be set install sprocket wheel (3), is connected with sprocket wheel (3) soon at a slow speed principal and subordinate's movable sprocket, be connected and fixed soon the at a slow speed transmission shaft of principal and subordinate's movable sprocket, the axle bed of fixed conveyor axle is installed in the at a slow speed transmission mechanism of kiln body (11) head end and the fast driving device of kiln body (11) end.
2. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, it is characterized in that: described at a slow speed transmission mechanism comprises at a slow speed live roll chain (2), slow speed motor (28), the second step-down gear (29), the first drive sprocket (40), the first active chain (30), the second drive sprocket (1), second driving shaft (42), the second axle bed (41), the second support (31) and the first driven sprocket (43), slow speed motor (28) is installed in the at a slow speed front end of transmission mechanism, upper the second step-down gear (29) of installing of slow speed motor (28), upper the first drive sprocket (40) of installing of the second step-down gear (29), the second drive sprocket (1) above initiatively chain (30) is connected on by first, the second drive sprocket (1) is connected in an end of second driving shaft (42), second driving shaft (42) is installed on the second axle bed (41), the second axle bed (41) is fixed on second support (31) of below, the other end of second driving shaft (42) is installed the first driven sprocket (43), at a slow speed live roll chain (2) is installed on the first driven sprocket (43), sprocket wheel (3) below links at a slow speed live roll chain (2), and the below of live roll chain (2) arranges chain holder (66) at a slow speed.
3. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, it is characterized in that: described fast driving device comprises quick live roll chain (21), quick motor (18), the 3rd step-down gear (17), the 4th drive sprocket (38), the second active chain (16), the 3rd drive sprocket (14), the first transmission shaft (36), the first axle bed (37), the first support (15) and the 4th driven sprocket (35), hydraulic top (19), hydraulic top support (20) and travel switch (12), motor (18) is installed in the end of fast driving device fast, motor (18) is upward installed the 3rd step-down gear (17) fast, upper the 4th drive sprocket (38) of installing of the 3rd step-down gear (17), the 3rd drive sprocket (14) above initiatively chain (16) is connected on by second, the 3rd drive sprocket (14) is connected in an end of the first transmission shaft (36), the first transmission shaft (36) is installed on the first axle bed (37), the first axle bed (37) is fixed on first support (15) of below, the other end of the first transmission shaft (36) is installed the 4th driven sprocket (35), the upper quick live roll chain (21) of installing of the 4th driven sprocket (35), the below of sprocket wheel (3) links quick live roll chain (21), the below of live roll chain (21) arranges chain holder (66) fast, hydraulic top (19) is installed in the terminal below of fast driving device, one end of hydraulic top support (20) is fixed on the angle steel (34) of kiln body (11) one sides, and travel switch (12) is installed on the crossbeam (13) in the middle of the least significant end of fast driving device.
4. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, it is characterized in that: described automatic feeder comprises feeding table, feeding table is for tilting to install, feeding table bottom arranges the weldless steel tube piece (45) of limiting the quantity of, panel (48) below at feeding table arranges thruster, and roller-way driving part top in feeding table the place ahead arranges weldless steel tube stopper slot (4).
5. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, it is characterized in that: described temperature control unit comprises thermopair and fuel burner nozzle, position, kiln body (11) upper middle, both sides arranges thermopair, the below of kiln body (11) both sides live rolls (8) arranges the fuel burner nozzle that a plurality of spacings are successively decreased, and is interspersed in kiln body (11) both sides.
6. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 4, it is characterized in that: described electrical control gear comprises limit switch (32), travel switch (12), limit switch (32) is installed on the weldless steel tube stopper slot (4) of automatic feeder (5), and travel switch (12) is installed in the fast driving device end.
7. one kind is utilized the hardening and tempering furnace of claim 1 to the heat treating method of hot rolled seamless steel tube, it is characterized in that: quench first, after carry out tempering, step is as follows:
Quench:
1.1 blowing is with neat being emitted on the automatic feeder (5) of pending heat treated weldless steel tube (9);
1.2, automatic feed, start that the weldless steel tube (9) on the automatic feeder (5) is admitted in the hardening and tempering furnace in order at regular intervals one by one behind the power supply;
1.3, preheating, weldless steel tube (9) vertically enters the preheating zone (27) of hardening and tempering furnace, movement velocity 0.255m/min, warm up time 20min;
1.4, heating, the weldless steel tube (9) of (27) preheating through the preheating zone continues to move forward and enters heating zone (25), movement velocity 0.255m/min, 300 ℃ of Heating temperatures, heat-up time 10min;
1.5, high temperature, continue to move forward through the weldless steel tube (9) of 300 ℃ of heating and enter high-temperature zone (24), movement velocity 0.255m/min, the heat temperature is 920 ℃, soaking time 8min;
1.6, quick tapping, enter the quick tapping section, movement velocity 6m/min, 12 seconds of quick tapping time through the weldless steel tube (9) of heat;
1.7, alignment, automatically sent into behind weldless steel tube (9) quick tapping and carry out alignment in the straightener and process 3 seconds of time;
1.8, water-cooled, after the weldless steel tube on the straightener (9) alignment, carry out spray quenching and process, the temperature of weldless steel tube (9) is dropped to rapidly below 300 ℃, finish quenching process;
Tempering:
2.1, blowing, pending weldless steel tube (9) neatly is emitted on the automatic feeder (5);
2.2, automatic feed, start that the weldless steel tube (9) on the automatic feeder (5) is admitted in the hardening and tempering furnace in order at regular intervals one by one behind the power supply;
2.3, preheating, weldless steel tube (9) vertically enters the preheating zone (27) of hardening and tempering furnace, movement velocity 0.255m/min, warm up time 20min;
2.4, heating, the weldless steel tube (9) of (27) preheating through the preheating zone continues to move forward and enters heating zone (25), movement velocity 0.255m/min, 300 ℃ of Heating temperatures, heat-up time 10min;
2.5, high temperature, continue to move forward through the weldless steel tube (9) of 300 ℃ of heating and enter high-temperature zone (24), movement velocity 0.255m/min, the heat temperature is 550 ℃, soaking time 8min;
2.6, quick tapping, enter the quick tapping section, movement velocity 6m/min, 12 seconds of quick tapping time through the weldless steel tube (9) of 550 ℃ of heat of temperature;
2.7, air cooling, the weldless steel tube behind the quick tapping (9) is placed in the air naturally cooling and finished drawing process to normal temperature in 4 ~ 5 hours.
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| CN103878276A (en) * | 2012-12-24 | 2014-06-25 | 上海市沪东锻造厂有限公司 | Energy conservation process of fuel gas forging thermal processing furnace |
| CN103910162A (en) * | 2012-12-29 | 2014-07-09 | 上海沃迪自动化装备股份有限公司 | Shaft seat type square roller vibration shaping conveyor |
| CN103464463B (en) * | 2013-09-26 | 2015-04-08 | 湖北中钢联冶金工程有限公司 | Continuous-casting and continuous-rolling integrating device and process |
| CN104195300B (en) * | 2014-09-16 | 2016-08-24 | 苏州中门子科技有限公司 | The heat treatment system of a kind of steel pipe and method |
| CN104726653A (en) * | 2015-03-02 | 2015-06-24 | 淄博奥博电气有限公司 | Residual heat tempering and quenching technique |
| CN105567935B (en) * | 2016-02-25 | 2017-11-21 | 马鞍山市伟群轨道交通装备有限公司 | A kind of chamber type annealing stove, tempering furnace induction system and tempering furnace control method |
| CN107245566B (en) * | 2017-07-03 | 2018-08-28 | 新沂市棋盘工业集中区建设发展有限公司 | A kind of annealing furnace automatic charging device |
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| CN201581114U (en) * | 2009-12-09 | 2010-09-15 | 山东正昌煤矿机械有限公司 | Energy-saving gas hardening and tempering furnace for hot rolled seamless steel pipes |
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| CN200978294Y (en) * | 2006-10-11 | 2007-11-21 | 山翁工业炉(嘉善)有限公司 | Fuel gas roller hearth spheroidizing annealing furnace |
| CN101250678A (en) * | 2008-03-19 | 2008-08-27 | 苏州中门子科技有限公司 | Low stove pressure convection continuous roller bottom type annealing furnace and annealing technique |
| CN201186941Y (en) * | 2008-05-06 | 2009-01-28 | 浙江海亮股份有限公司 | Direct combustion type metal pipes bright heat treatment furnace |
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