CN201096120Y

CN201096120Y - Heating stove walking beam speed regulating device

Info

Publication number: CN201096120Y
Application number: CNU2007200689861U
Authority: CN
Inventors: 宗成
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2007-04-16
Filing date: 2007-04-16
Publication date: 2008-08-06
Anticipated expiration: 2017-04-16

Abstract

The utility model discloses a stepping type speed regulating device for a stepping beam of a heating furnace. The speed regulating device for the stepping beam of the heating furnace comprises a hydraulic cylinder, a three-position four-way electromagnetic reversing valve, a hydraulic pump, a first unidirectional speed regulating valve, a first electromagnetic reversing valve, a second unidirectional speed regulating valve and a second electromagnetic reversing valve, wherein, the first unidirectional speed regulating valve is connected with the first electromagnetic reversing valve in parallel, and the second unidirectional speed regulating valve is connected with the second electromagnetic reversing valve in parallel. The watermark temperature difference of a fixing beam of a plate blank is lightened, the productive efficiency is increased, and the life of the device is prolonged via the speed regulating device for the stepping beam of the heating furnace of the utility model.

Description

Oven step rate arrangements for speed regulation

Technical field

The utility model relates to a kind of oven, particularly a kind of walking beam furnace step rate arrangements for speed regulation.

Background technique

Walking beam furnace is the seventies for solving the type of furnace that watermark defective that the slideway pusher-type furnace brings designs, because the watermark defective is obviously controlled, strip steel manufacturing enterprise all adopts walking beam furnace in the world, and uses till today.

Be divided into step rate and fixed beam in its stove, beam and slab point of contact distribute with the heat-resisting cushion block of horse shoe shaped, and step rate and fixed beam are vertically arranged.Slab is placed on the fixed beam after going into stove, and the regular-shape motion by step rate moves forward then, the rectangular path operation one-period 580mm that advances.Fig. 1 is the driving mode schematic representation of step rate, and moving forward and backward of step rate 1 drives by oil hydraulic cylinder 2, and rising and descending is that motor drives eccentric wheel 3 drivings by double reduction.

After slab was gone into stove, eccentric wheel 3 began to turn clockwise, and at this moment step rate is begun to rise by origin position, and step rate 1 rises and puts in place behind eccentric wheel 3 Rotate 180s °, and at this moment eccentric wheel 3 stops the rotation; Oil hydraulic pump 5 entrys into service, at this moment the 2DT of 3-position 4-way solenoid directional control valve 4 energising, at this moment in-line is 2 right chambeies from oil hydraulic pump 5 to oil hydraulic cylinder, oil circuit is that oil hydraulic cylinder 2 left chambeies are to fuel tank, thereby the action drive step rate 1 by oil hydraulic cylinder 2 advances, when step rate 1 run into advance spacing after step rate advance and put in place, oil hydraulic pump 5 shuts down; Eccentric wheel 3 begins to turn clockwise, and at this moment step rate 1 begins to descend, and step rate 1 descends and puts in place behind eccentric wheel 3 Rotate 180s °, and at this moment eccentric wheel 3 stops the rotation; Oil hydraulic pump 5 entrys into service, at this moment the 1DT of 3-position 4-way solenoid directional control valve 4 energising, in-line is 2 left chambeies from oil hydraulic pump 5 to oil hydraulic cylinder, oil circuit is to fuel tank from oil hydraulic cylinder 2 right chambeies, thereby the action drive step rate 1 by oil hydraulic cylinder 2 retreats, when step rate 1 run into retreat spacing after step rate retreat and put in place, oil hydraulic pump 5 shuts down, at this moment step rate 1 is got back to origin position.The movement locus of step rate is clockwise rectangle.

The definition of watermark point and the watermark temperature difference: the position of slab contact water-cooled beam is called the watermark point, the temperature difference appellation watermark temperature difference at general heating temperature and non-contact position low than the non-contact position.

Because water flowing circulation cooling in the beam, in the cooling water beam also to beam on cushion block implemented cooling, between cushion block and slab, make the low watermark temperature difference that produces of temperature of point of contact because of the effect of temperature conduction.The watermark temperature difference can be divided into the step rate watermark temperature difference and the fixed beam watermark temperature difference because of the function of water beam.Point of contact when step rate holds up slab claims step rate watermark point; After step rate descended, slab was placed on the point of contact on the fixed beam, is referred to as fixed beam watermark point.

Existing oven furnace superintendent is 40 meters, deducts to take on the material two ends and take on nearly 3 meters of gap of material, and the step rate all 580mm that advance, step rate move about 65 cycles and can reach 0.58m * 65=37.70m to extracting end out.And step rate needs 60 seconds one working time in week, and wherein slab contacted step rate, other 30 seconds contact fixed beams in 30 seconds.Actual slab moves to extraction side=65 week * 30 second=1950 seconds ≈ 32.5 minutes from charging end.The actual slab contact step rate cushion block time is about 32.5 minutes, and the watermark temperature difference is little.

Calculated by 160 minutes the shortest heating times, slab contact fixed beam watermark time=160 minute-32.5 minutes (the contact step rate time) in the actual stove=127.5 minutes, therefore, it is big that fixed beam produces the watermark temperature difference.

Because the temperature difference is big, the high temperature dot distortion in rolling is big, and the low temperature point deformation is little, makes width, thickness, the convexity precision of band steel be difficult to control, has influenced the raising of quality of product significantly.

In order to address this problem, adopted and found that in rolling the watermark temperature difference is big, oven just stops to take out steel, by lifting stepping fine strain of millet slab is held up, to alleviate the maneuver of the fixed beam watermark temperature difference.

But, because the time that stepping fine strain of millet lifts is usually at 8～10 minutes, so though adopt this maneuver to solve the big problem of the fixed beam watermark temperature difference, had a strong impact on the hourly output of rolling line.And drive the eccentric wheel driving because rising of stepping fine strain of millet and decline are motor by worm speed reducer, slab is held up, easily eccentric live axle is damaged, shorten the life-span of equipment so lift stepping fine strain of millet for a long time manually.

By slowing down the speed that stepping fine strain of millet moves forward and backward, the time lengthening that slab is stopped on stepping fine strain of millet, thereby the time that the shortening slab stops on fixed beam are to alleviate the slab fixed beam watermark temperature difference.But simple slow down the speed that stepping fine strain of millet moves forward and backward, will make rolling line thicker at the thickness that manufactures a finished product, during slab that perhaps the supplied materials width is bigger, oven can not in time be connected fire door laser, causes slab to extract out, thereby the hourly output of having a strong impact on.

So, if should alleviate the slab fixed beam watermark temperature difference, do not influence hourly output again, must be able to make the operation of oven adjust the speed that stepping fine strain of millet moves forward and backward according to different supplied materials width and finished product thicknesses.

Summary of the invention

For addressing the above problem, the utility model provides a kind of oven step rate arrangements for speed regulation, by adjusting the speed that stepping fine strain of millet moves forward and backward, promptly by slowing down the speed that stepping fine strain of millet moves forward and backward, the time lengthening that slab is stopped on stepping fine strain of millet, thereby shorten the time that slab stops on fixed beam, to alleviate the slab fixed beam watermark temperature difference.

For achieving the above object, oven step rate arrangements for speed regulation of the present utility model, comprise oil hydraulic cylinder, 3-position 4-way solenoid directional control valve, oil hydraulic pump, also comprise the first unidirectional series flow control valve, first solenoid directional control valve, the second unidirectional series flow control valve, second solenoid directional control valve, the described first unidirectional series flow control valve is in parallel with first solenoid directional control valve, and the second unidirectional series flow control valve is in parallel with second solenoid directional control valve.

The described first unidirectional series flow control valve and the second unidirectional series flow control valve are in series by Fixed differential reducing valve and throttle valve respectively.

Oven step rate arrangements for speed regulation of the present utility model, the operator that can make oven is according to concrete steel rhythm and the supplied materials width taken out, make 3DT and 4DT energising respectively, slow down the speed that stepping fine strain of millet advances, thereby change the time of step rate motion one-period, the time lengthening that slab is stopped on stepping fine strain of millet, thus the time that slab stops shortened on fixed beam, alleviated the slab fixed beam watermark temperature difference.

Owing to can change the speed that stepping fine strain of millet advances at any time, thereby change time of step rate motion one-period, thus can guarantee oven take out steel rhythm, thereby guarantee the hourly output of rolling line, improved manufacturing efficiency.And owing to stopped to lift stepping fine strain of millet for a long time manually slab is held up,, prolonged the life-span of equipment so stopped injury that eccentric live axle is caused.

Description of drawings

Fig. 1 is the driving mode schematic representation of step rate;

Fig. 2 is the hydraulic scheme of oven step rate arrangements for speed regulation of the present utility model;

Fig. 3 is the formation schematic representation of unidirectional series flow control valve.

Embodiment

Fig. 2 is the hydraulic scheme of oven step rate arrangements for speed regulation of the present utility model.Oven step rate arrangements for speed regulation comprise oil hydraulic cylinder 2,3-position 4-way solenoid directional control valve 4, oil hydraulic pump 5, the first unidirectional series flow control valve 6, first solenoid directional control valve, 7, the second unidirectional series flow control valve 8, second solenoid directional control valve 9.Promptly in speed control system shown in Figure 1, increase by the first unidirectional series flow control valve 6, first solenoid directional control valve, 7, the second unidirectional series flow control valve 8, second solenoid directional control valve 9.At the left side of oil hydraulic cylinder oil circuit, promptly oil circuit increases by the first unidirectional series flow control valve 6 and the second unidirectional series flow control valve 8, and each is in parallel respectively with a bi-bit bi-pass solenoid directional control valve 7,9, and unidirectional series flow control valve does not play throttling action when the fluid reverse flow.

Adopt oven step rate arrangements for speed regulation of the present utility model, make the furnace operation worker to control electromagnet 3DT and 4DT energising and outage respectively at the furnace operation platform.

Then, make electromagnet 3DT energising, by the aperture of throttle valve in the Field adjustment first unidirectional series flow control valve 7, thereby change controlled flow, the time that stepping fine strain of millet is advanced became about 40 seconds by original 20 seconds, locked after being adjusted to required flow; Make electromagnet 4DT energising, by the aperture of throttle valve in the Field adjustment second unidirectional series flow control valve 9, thereby change controlled flow, the time that stepping fine strain of millet is advanced became about 60 seconds by original 20 seconds, locked after being adjusted to required flow.

The time that stepping fine strain of millet advances when electromagnet 3DT switches on is 40 seconds, adds the 20 seconds time that the time was respectively 10 seconds and stepping fine strain of millet retreats of rising and descending, and makes that into the time of beam motion one-period became 80 seconds by original 60 seconds; The time that stepping fine strain of millet advances when electromagnet 4DT switches on is 60 seconds, adds the 20 seconds time that time was respectively 10 seconds and stepping fine strain of millet retreats that stepping fine strain of millet rises and descends, and makes the time of step rate motion one-period become 100 seconds by original 60 seconds.

The operator of oven can make 3DT and 4DT energising respectively according to concrete steel rhythm and the supplied materials width taken out, and slows down the speed that stepping fine strain of millet advances, thereby changes the time of step rate motion one-period.

For example: the steel rhythm of taking out of oven is 100 seconds, when the supplied materials width is 1250mm, illustrate that the slab in front extracts back step rate next the piece slab of three cycles that will move out and could connect fire door laser, and the steel rhythm of taking out of single seat stove is 100*3=300 second, at this moment the operator of oven just can make the 3DT energising, makes that the time in step rate three cycles of motion is 80*3=240 second.

The steel rhythm of taking out of oven is 120 seconds, when the supplied materials width is 1250mm, illustrate that the slab in front extracts back step rate next the piece slab of three cycles that will move out and could connect fire door laser, and the steel rhythm of taking out of single seat stove is 120*3=360 second, at this moment the operator of oven just can make the 4DT energising, makes that the time in step rate two cycles of motion is 100*3=300 second.

Because the slab weight on the step rate is constantly changing, and the throttle valve flow control circuit all exists the problem that load variations causes velocity variations, and institute thinks that the movement velocity that makes step rate stablizes, and native system has adopted unidirectional series flow control valve.Fig. 3 is the formation schematic representation of unidirectional series flow control valve, and as shown in the figure, the first unidirectional series flow control valve 6 is in series by Fixed differential reducing valve 11 and throttle valve 12, and the second unidirectional series flow control valve 8 is the same with first unidirectional series flow control valve 6 structures.Fixed differential reducing valve 11 can keep throttle valve 12 two ends pressure reduction constant automatically, thereby makes the movement velocity of step rate not be subjected to the influence of slab weight change.

In the oil circuit throttling speed control circuit, the energy loss that fluid produces when flowing through throttle valve makes fluid heating back oil sump tank, and is by reentering pump and oil hydraulic cylinder again after the fuel tank heat radiation cooling, less to the oil hydraulic cylinder leakage contribution.

Claims

1. oven step rate arrangements for speed regulation, comprise oil hydraulic cylinder, 3-position 4-way solenoid directional control valve, oil hydraulic pump, it is characterized in that, also comprise the first unidirectional series flow control valve, first solenoid directional control valve, the second unidirectional series flow control valve, second solenoid directional control valve, the described first unidirectional series flow control valve is in parallel with first solenoid directional control valve, and the second unidirectional series flow control valve is in parallel with second solenoid directional control valve.

2. oven step rate arrangements for speed regulation as claimed in claim 1 is characterized in that, the described first unidirectional series flow control valve and the second unidirectional series flow control valve are in series by Fixed differential reducing valve and throttle valve respectively.