CN102094114A - 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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- CN102094114A CN102094114A CN 200910255626 CN200910255626A CN102094114A CN 102094114 A CN102094114 A CN 102094114A CN 200910255626 CN200910255626 CN 200910255626 CN 200910255626 A CN200910255626 A CN 200910255626A CN 102094114 A CN102094114 A CN 102094114A
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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 weldless steel tube thermal treatment field, are specifically related to a kind of combustion gas quenching and tempering device and technology 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, promptly improve the intensity and the toughness of weldless steel tube, reach the use properties of expection, this handle quenching and tempering bonded technology are referred to as modified, and this implementation of processes is used box-type furnace or intermediate frequency furnace usually.The box-type furnace heating is inhomogeneous, the two ends temperature that is weldless steel tube is low, and the medium temperature height, thereby the high temperature that steel tube place obtains is mutually 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 big.Box-type furnace also can not be realized tempering process, need set up tempering stove separately.Realize that quenching and tempering must increase electric power, be unfavorable for expanding the scale of production, and the intermediate frequency furnace cost of investment are 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 big;
3, electric power is big, 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 is provided with 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 the 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 the live roll, the live roll two ends that are installed in kiln body two ends and kiln body inside protrude from an end outer most bits that kiln body below is provided with 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 transmission shaft of principal and subordinate's movable sprocket at a slow speed, the axle bed of fixed conveyor axle is installed in the transmission mechanism at a slow speed of kiln body head end and the quick transmission mechanism of kiln body end.
Described transmission mechanism at a slow speed comprises live roll chain at a slow speed, slow speed motor, second step-down gear, first drive sprocket, the first active chain, second drive sprocket, second transmission shaft, second axle bed, second support and first driven sprocket, slow speed motor is installed in the front end of transmission mechanism at a slow speed, second step-down gear is installed on the slow speed motor, first drive sprocket is installed on second step-down gear, second drive sprocket above initiatively chain is connected on by first, second drive sprocket is connected in an end of second transmission shaft, second transmission shaft is installed on second axle bed, second axle bed is fixed on second support of below, the other end of second transmission shaft is installed first driven sprocket, live roll chain at a slow speed is installed on first driven sprocket, the sprocket wheel below links live roll chain at a slow speed, and the below of live roll chain is provided with 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 adjustment wheel that is fixed on the angle bar frame below at a slow speed.
Described quick transmission mechanism comprises quick live roll chain, fast speed motor, the 3rd step-down gear, the 4th drive sprocket, the second active chain, the 3rd drive sprocket, first transmission shaft, first axle bed, first support and the 4th driven sprocket, the hydraulic pressure top, hydraulic pressure ceiling hold and travel switch, fast speed motor is installed in the end of quick transmission mechanism, on the fast speed motor the 3rd step-down gear is installed, 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 first transmission shaft, first transmission shaft is installed on first axle bed, first axle bed is fixed on first support of below, the other end of 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 is provided with 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 adjustment wheel that is fixed on the angle bar frame below fast, the hydraulic pressure top is installed in the terminal below of quick transmission mechanism, one side of hydraulic pressure ceiling hold is fixed on the angle steel of kiln body one side, and travel switch is installed on the least significant end intermediary crossbeam of quick transmission mechanism.
Described automatic feeder comprises feeding table, and feeding table is for tilt installing, and the feeding table bottom is provided with 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 is provided with 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 is provided with thermopair, and the below of kiln body both sides live roll is provided with 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 fuel burner nozzle control intravital gas quantity of kiln and then controlled temperature.
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 quick transmission mechanism end, by the top work of open and close mode control hydraulic pressure.
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 shifts out the kiln body fast and contacts with the travel switch of roller-way driving part end after moving at a slow speed earlier forward on the live roll, travel switch makes the hydraulic pressure top rise rapidly and weldless steel tube is sent, it is untimely to cause quenching to reduce temperature decrease, and modified effect is undesirable.
A kind of heat treating method that utilizes the hardening and tempering furnace of claim 1 to hot rolled seamless steel tube is characterized in that: quench earlier, 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, and through the heating of 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 quick transmission mechanism;
1.6, come out of the stove fast, 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 is provided with quick transmission mechanism, when weldless steel tube arrives quick transmission mechanism, its preceding line speed is promoted to 6m/min by original 0.255m/min, and weldless steel tube is come out of the stove about 12 seconds fast, arrives subsequent processing;
1.7, alignment, the weldless steel tube about 920 ℃ is sent to automatically to carry out alignment and handles in the straightener, finish through about 3 seconds;
1.8, water-cooled, after alignment was finished in a last operation, the water source on the straightener then carries out spray quenching to weldless steel tube to be handled, 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, carries out preheating procedure through the time of 20min in moving forward and handles.
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, and through the heating of 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 quick transmission mechanism.
2.6, come out of the stove fast, 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 is provided with quick transmission mechanism, when weldless steel tube arrives quick transmission mechanism, its preceding line speed is promoted to 6m/min by original 0.255m/min, and weldless steel tube is come out of the stove about 12 seconds fast, arrives subsequent processing.
2.7, air cooling, the weldless steel tube after coming out of the stove fast 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 had 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 adopt 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; Hardening and tempering furnace output is produced 360 high every day, and box-type furnace is produced 136 daily, and output has improved 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 the combustion 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 quenching and the required temperature of tempering process;
3, the preheating zone of kiln body, heating zone and high-temperature zone can make weldless steel tube full and uniform at kiln body internal heating, and heat energy utilization is abundant;
4, transmission mechanism is taken weldless steel tube out of the kiln body fast fast, 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 height, cost are low.
Description of drawings
Fig. 1 is the energy-saving hot rolled seamless steel tube combustion gas of a present invention hardening and tempering furnace master TV structure synoptic diagram.
Fig. 2 is Fig. 1 plan structure synoptic diagram.
Fig. 3 is that Figure 1B is to automatic feeder master TV structure synoptic diagram.
Fig. 4 is Fig. 3 plan structure synoptic diagram.
Fig. 5 is Fig. 2 D place enlarged diagram.
Fig. 6 is Figure 1A-A sectional structure synoptic 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, 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, first support 16, the second active chain 17, the 3rd step-down gear 18, fast speed motor 19, hydraulic pressure top 20, hydraulic pressure ceiling hold 21, quick live roll chain 22, chain adjustment 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, second step-down gear 30, the first active chain 31, second support 32, limit switch 33, high-temperature zone thermopair 34, angle steel 35, the 4th driven sprocket 36, first transmission shaft 37, first axle bed 38, the 4th drive sprocket 39, flue 40, first drive sprocket 41, second axle bed 42, second transmission shaft 43, 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, first step-down gear 50, eccentric wheel 51, angle bar frame 52, connecting rod 53, thruster motor 54, steady bearing 55, anti-grinding 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, 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, quick transmission mechanism, 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-grinding ring 55, angle steel 34, angle bar frame 51, adjusts bolt 65, chain holder 66, chain adjustment wheel 22, principal and subordinate's movable sprocket, transmission shaft, axle bed, transmission mechanism, transmission mechanism fast at a slow speed.
The front end below of roller-way driving part is provided with transmission mechanism at a slow speed, transmission mechanism comprises live roll chain 2 at a slow speed at a slow speed, slow speed motor 28, second step-down gear 29, first drive sprocket 40, the first active chain 30, second drive sprocket 1, second transmission shaft 42, second axle bed 41, second support 31 and first driven sprocket 43, the front end of transmission mechanism is provided with slow speed motor 28 at a slow speed, second step-down gear 29 is installed on the slow speed motor 28, first drive sprocket 40 is installed on second step-down gear 29, second drive sprocket 1 above initiatively chain 30 is connected on by first, second drive sprocket 1 is connected in an end of second transmission shaft 42, second transmission shaft 42 is installed on second axle bed 41, second axle bed 41 is fixed on second support 31 of below, the other end of second transmission shaft 42 is installed first driven sprocket 43, live roll chain 2 at a slow speed is installed on first driven sprocket 43, sprocket wheel 3 belows link live roll chain 2 at a slow speed, the below of live roll chain 2 is provided with 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 adjustment wheel 22 that is fixed on angle bar frame 51 belows at a slow speed.
The terminal below of roller-way driving part is provided with quick transmission mechanism, transmission mechanism comprises quick live roll chain 21 fast, fast speed motor 18, the 3rd step-down gear 17, the 4th drive sprocket 38, the second active chain 16, the 3rd drive sprocket 14, first transmission shaft 36, first axle bed 37, first support 15 and the 4th driven sprocket 35, hydraulic pressure top 19, hydraulic pressure ceiling hold 20, travel switch 12, the end of transmission mechanism is provided with fast speed motor 18 fast, on the fast speed motor 18 the 3rd step-down gear 17 is installed, 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 first transmission shaft 36, first transmission shaft 36 is installed on first axle bed 37, first axle bed 37 is fixed on first support 15 of below, the other end of 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 is provided with 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 adjustment wheel 22 that is fixed on angle bar frame 51 belows fast, the terminal below of transmission mechanism is provided with hydraulic pressure top 19 fast, hydraulic pressure ceiling hold 20 is fixed on and acts on the angle steel 34 of kiln body 11 1 sides on the hydraulic pressure top 19, the travel switch 12 that is provided with in the middle of the least significant end of quick transmission mechanism, travel switch 12 is fixed on the crossbeam 13 of quick transmission mechanism end.
Shown in Fig. 3～4:
Be provided with and the vertical automatic feeder 5 of kiln body 11 length directions 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 tilt and panel 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, first step-down gear 49, eccentric wheel 50, connecting rod 52, weldless steel tube push pedal 46, the below of feeding table panel 48 is provided with thruster motor 53, first step-down gear 49 is installed on the thruster motor 53, setting-up eccentricity wheel 50 on 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 band 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 installed limit switch 32 near an end of kiln bodies 11.
Shown in Fig. 1～2:
The both sides of kiln body are provided with 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 are provided with heating zone thermopair 10 and high-temperature zone thermopair 33 respectively, the below of kiln body both sides live roll 8 is provided with heating zone fuel burner nozzle 26 and high-temperature zone fuel burner nozzle 23 respectively, 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 flame size respectively, 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 heating zone thermopair 10 and high-temperature zone thermopair 33 detected temperature arrive 300 ℃ and 920 ℃ respectively connection electric power starting 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 first step-down gear, eccentric wheel 50 on 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 motion in kiln body 11.46 repositions of weldless steel tube push pedal meanwhile, another part weldless steel tube 9 is rolled into the top of weldless steel tube push pedal 46 again down, obtain the limit switch 32 on the proal weldless steel tube 9 contact weldless steel tube stopper slots 4, make thruster motor 53 have a power failure, eccentric wheel 50 stops operating, treat weldless steel tube 9 on the live roll 8 of 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 transmission mechanism at a slow speed 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 fast speed motor 18.Slow speed motor 28 drives 29 work of second step-down gear, drive first initiatively chain 30 motions by first drive sprocket 40 on second step-down gear 29, first initiatively chain 30 drives second drive sprocket 1 rotation, second drive sprocket 1 drives second transmission shaft 42 and rotates, second transmission shaft 42 drives first driven sprocket 43 and rotates, and then drive the motion of live roll chain 2 at a slow speed, live roll chain 2 moves in chain holder 66 and drives the sprocket wheel 3 that links with it and rotates at a slow speed, and then drive all live rolls 8 that link with live roll chain 2 at a slow speed and on steady bearing 54, rotate, 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 20min altogether 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 quick transmission mechanism head end that weldless steel tube 9 arrives in the kiln body 11 after the heat of high-temperature zone 24 experience 8min.
Undertaken by the quenching process step equally during tempering, the temperature to 550 ℃ that different is regulates high-temperature zones 24 in the kiln body 11, make weldless steel tube 9 thermally equivalents obtain this temperature, coming out of the stove fast is placed in the air self-heating cooling 4～5 hours to normal temperature, finishes the tempering whole process.
Weldless steel tube is heated evenly by the heating of combustion gas hardening and tempering furnace, and transmission mechanism can make weldless steel tube obtain ideal quenching and tempering temperature fast, 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 did, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (9)
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 is provided with 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).
2. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, it is characterized in that: 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 are provided with flue (39) and chimney (6) respectively in the preheating zone, are the kiln body passage (63) of charging in the middle of the kiln body (11).
3. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, it is characterized in that: described roller-way driving part comprises the live roll (8) that is installed in kiln body (11) two ends and kiln body (11) inside, the below that two ends protrude from the live roll (8) of kiln body (11) both sides is provided with steady bearing (54), one end outer most bits of live roll (8) is installed sprocket wheel (3), the principal and subordinate's movable sprocket at a slow speed soon that is connected with sprocket wheel (3), be connected and fixed the fast transmission shaft of principal and subordinate's movable sprocket at a slow speed, the axle bed of fixed conveyor axle is installed in the transmission mechanism at a slow speed of kiln body (11) head end and the quick transmission mechanism of kiln body (11) end.
4. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 3, it is characterized in that: described transmission mechanism at a slow speed comprises live roll chain (2) at a slow speed, slow speed motor (28), second step-down gear (29), first drive sprocket (40), the first active chain (30), second drive sprocket (1), second transmission shaft (42), second axle bed (41), second support (31) and first driven sprocket (43), slow speed motor (28) is installed in the front end of transmission mechanism at a slow speed, slow speed motor (28) is gone up second step-down gear (29) is installed, second step-down gear (29) is gone up first drive sprocket (40) is installed, second drive sprocket (1) above initiatively chain (30) is connected on by first, second drive sprocket (1) is connected in an end of second transmission shaft (42), second transmission shaft (42) is installed on second axle bed (41), second axle bed (41) is fixed on second support (31) of below, the other end of second transmission shaft (42) is installed first driven sprocket (43), live roll chain (2) at a slow speed is installed on first driven sprocket (43), sprocket wheel (3) below links live roll chain (2) at a slow speed, and the below of live roll chain (2) is provided with chain holder (66) at a slow speed.
5. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 3, it is characterized in that: described quick transmission mechanism comprises quick live roll chain (21), fast speed motor (18), the 3rd step-down gear (17), the 4th drive sprocket (38), the second active chain (16), the 3rd drive sprocket (14), first transmission shaft (36), first axle bed (37), first support (15) and the 4th driven sprocket (35), hydraulic pressure top (19), hydraulic pressure ceiling hold (20) and travel switch (12), fast speed motor (18) is installed in the end of quick transmission mechanism, fast speed motor (18) is gone up the 3rd step-down gear (17) is installed, the 3rd step-down gear (17) is gone up the 4th drive sprocket (38) is installed, 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 first transmission shaft (36), first transmission shaft (36) is installed on first axle bed (37), first axle bed (37) is fixed on first support (15) of below, the other end of first transmission shaft (36) is installed the 4th driven sprocket (35), the 4th driven sprocket (35) is gone up quick live roll chain (21) is installed, the below of sprocket wheel (3) links quick live roll chain (21), the below of live roll chain (21) is provided with chain holder (66) fast, hydraulic pressure top (19) is installed in the terminal below of quick transmission mechanism, one end of hydraulic pressure ceiling hold (20) is fixed on the angle steel (34) of kiln body (11) one sides, and travel switch (12) is installed on the least significant end intermediary crossbeam (13) of quick transmission mechanism.
6. 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 (5) comprises feeding table, feeding table is for tilting to install, feeding table bottom is provided with the weldless steel tube piece (45) of limiting the quantity of, panel (48) below at feeding table is provided with thruster, and roller-way driving part top in feeding table the place ahead is provided with weldless steel tube stopper slot (4).
7. 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 is provided with thermopair, the below of kiln body (11) both sides live rolls (8) is provided with the fuel burner nozzle that a plurality of spacings are successively decreased, and is interspersed in kiln body (11) both sides.
8. energy-saving hot rolled seamless steel tube combustion gas hardening and tempering furnace according to claim 1, 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 quick transmission mechanism end.
9. heat treating method that utilizes the hardening and tempering furnace of claim 1 to hot rolled seamless steel tube is characterized in that: quench earlier, 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 entering high-temperature zone (24) through the weldless steel tube (9) of 300 ℃ of heating, movement velocity 0.255m/min, the heat temperature is 920 ℃, soaking time 8min;
1.6, come out of the stove fast, enter the section of coming out of the stove fast through the weldless steel tube (9) of heat, movement velocity 6m/min comes out of the stove 12 seconds of time fast;
1.7, alignment, weldless steel tube (9) back of coming out of the stove is fast sent into automatically and is carried out alignment in the straightener and handle 3 seconds of time;
1.8, water-cooled, after the weldless steel tube on the straightener (9) alignment is finished, carry out spray quenching and handle, 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 entering high-temperature zone (24) through the weldless steel tube (9) of 300 ℃ of heating, movement velocity 0.255m/min, the heat temperature is 550 ℃, soaking time 8min;
2.6, come out of the stove fast, enter the section of coming out of the stove fast through the weldless steel tube (9) of 550 ℃ of heat of temperature, movement velocity 6m/min comes out of the stove 12 seconds of time fast;
2.7, air cooling, the weldless steel tube (9) after coming out of the stove fast is placed in the air naturally cooling and finished drawing process to normal temperature in 4～5 hours.
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