CN210023271U

CN210023271U - Controlled cooling device used in production process of steel rolling rod and wire

Info

Publication number: CN210023271U
Application number: CN201920728229.5U
Authority: CN
Inventors: 胡建民
Original assignee: Handan Guanghua Precision Machinery Manufacturing Co Ltd
Current assignee: Handan Guanghua Precision Machinery Manufacturing Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-02-07
Anticipated expiration: 2029-05-21

Abstract

The utility model relates to a controlled cooling device used in the production process of rolled steel bar and wire, which comprises a water cooling box and a cooling unit arranged in the water cooling box, wherein the cooling unit comprises a group of coolers which are sequentially arranged along the feeding direction of rolled pieces, the coolers are fixedly connected with the water cooling box by means of an installation unit, the coolers comprise a shell, a feeding guide pipe, a middle guide pipe and a discharging guide pipe which are sequentially arranged in the shell along the feeding direction of the rolled pieces, a water inlet cavity connected with a water inlet of the box by means of a water inlet of the shell is arranged on the shell, the discharging end of the feeding guide pipe is positioned in the water inlet cavity, a gap is arranged between the discharging end of the feeding guide pipe and the middle guide pipe, the cross sections of the tail end of the water inlet cavity, the two ends of the inner cavity of the middle guide pipe and the front end of the inner cavity of the discharging guide pipe are respectively in a trapezoidal, the strength and the toughness of the steel rolling bar wire are greatly improved.

Description

Controlled cooling device used in production process of steel rolling rod and wire

Technical Field

The utility model belongs to the technical field of steel rolling production facility, a cooling device is related to, specifically speaking is a accuse cold charge is used to steel rolling stick wire rod production in-process.

Background

With the development of the steel industry in China, how to improve the product performance and achieve the purposes of energy conservation and consumption reduction becomes the development direction of future steel enterprises. Currently, most enterprises adopt a microalloying method to produce the III-grade twisted steel, so that the content of vanadium or niobium is increased, the strength of the twisted steel is increased by utilizing the precipitation strengthening effect of vanadium or niobium carbonitride, and the increase of the content of vanadium or niobium greatly increases the product cost. Therefore, the application of the temperature control technology in the steel rolling process becomes a feasible, economic and usable process technology which is worth of wide popularization in future production of building steel in China, the metallographic structure of the steel is optimized by adopting a reasonably controlled rolling process of metal heating, rolling and cooling, and the strength of the steel bar is greatly improved.

At present, the cooling method commonly adopted by steel mills is pure water direct injection cooling, in order to achieve better cooling effect, when large-size bars are produced, the cooling efficiency is generally improved by increasing the water pressure, but the energy consumption is correspondingly increased by overhigh water pressure, and the danger in the production process is improved; under traditional high pressure cooling form, because the rolled piece wall temperature of refrigerated is very high, the boiling heat transfer is in the film state boiling stage, and the rolled piece surface can form one deck air film, prevents cooling water and rolled piece further contact, greatly reduced boiling heat transfer coefficient, makes heat transfer efficiency reduce, influences production efficiency, simultaneously because the cooling effect of steel is unsatisfactory, the product quality who produces also receives certain influence, reduces the quality of product.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a accuse cold charge is put in steel rolling excellent line production process, cooling water pressure greatly reduced, and reduced the formation of air film, realize that refrigerated high efficiency is low consumed, the intensity and the toughness of steel rolling excellent line obtain improving by a wide margin.

The utility model adopts the technical proposal that:

a cooling control device used in the production process of steel rolling rods and wires comprises a water cooling tank and a cooling unit arranged in the water cooling tank, wherein a tank body water inlet and a water falling hole which are matched with the cooling unit are respectively arranged on the water cooling tank, the key is that the cooling unit comprises a group of coolers which are sequentially arranged along the feeding direction of a rolled piece, the coolers are fixedly connected with the water cooling tank by virtue of an installation unit, each cooler comprises a shell, a feeding guide pipe, a middle guide pipe and a discharging guide pipe which are sequentially arranged in the shell along the feeding direction of the rolled piece, a gap is arranged between the discharging guide pipe of the former cooler and the feeding guide pipe of the latter cooler, a water inlet cavity connected with the tank body water inlet by virtue of the shell water inlet is arranged on the shell, the discharging end of the feeding guide pipe is positioned in the water inlet cavity and a gap is arranged between the feeding guide pipe and the middle guide pipe, the cross sections of the tail end of the water inlet cavity, the two ends of the inner cavity of the middle guide pipe and the front end of the inner cavity of the discharging guide pipe are respectively of a trapezoidal structure, and the lower bottoms of the two ends of the inner cavity of the middle guide pipe are respectively connected with the upper bottom of the tail end of the water inlet cavity and the lower bottom of the front end of the inner cavity of the discharging guide pipe.

The outer wall of the middle guide pipe and the outer wall of the discharging guide pipe are respectively attached to the inner wall of the shell, and an end cover matched with the discharging guide pipe is arranged on the shell.

The installation unit include the branch water beam, the clamp plate of being connected with the water-cooling tank, divide the water beam to go up to be provided with a set of spacing arch supporting with the casing along the horizontal direction of perpendicular to rolled piece's direction of feed, the clamp plate links firmly and is provided with the housing supporting clamp bolt with the branch water beam with the help of connecting bolt on the clamp plate, divide the water hole that is provided with on the water beam, the entry, the export of crossing the water hole link up with box inlet opening, casing inlet opening respectively.

The middle part of the water diversion beam is provided with a through hole parallel to the arrangement direction of the limiting bulge.

The water hole of crossing in be provided with into water distributing pipe, water distributing pipe tip is provided with the turning handle that is located the water beam outside, is provided with rotary seal circle between turning handle and the water beam of dividing, crosses the support that is provided with a set of water distributing pipe in the water hole, the front end of water distributing pipe and the entry linkage in water hole of crossing, water distributing pipe is gone up and is seted up along its circumferencial direction in proper order and crosses the supporting single port and the multiple port in the export in water hole.

The outer wall of the discharge end of the feeding guide pipe is conical.

The length ratio of the cooler to the water cooling tank is 1 (7-10).

The outer wall of the feeding guide pipe is provided with a group of shunting lugs arranged in an annular array.

The utility model has the advantages that: the method is characterized in that a plurality of coolers are arranged in a water cooling tank along the feeding direction of a rolled piece, the number of the coolers is increased under the condition of the same cooling length, the length of the coolers is greatly reduced, the number of water spraying times is increased, the pressure of required cooling water is obviously reduced, the direct contact efficiency of the cooling water and the rolled piece is improved, the total length of an intermediate guide pipe and a discharge guide pipe is shortened, and the formation of an air film is reduced;

the tail end of the water inlet cavity, the two ends of the inner cavity of the middle guide pipe and the front end of the inner cavity of the discharging guide pipe are respectively provided with a structure with a trapezoidal cross section, and a rolled piece is extruded with water in the water inlet cavity when entering the middle guide pipe from the tail end of the water inlet cavity through the feeding guide pipe, so that the water carrying capacity of the rolled piece is improved, the rolled piece can conveniently take water in the water inlet cavity to the front, and cooling water is provided for the middle guide pipe and the discharging guide pipe; the two ends of the inner cavity of the middle guide pipe and the front end of the inner cavity of the discharging guide pipe are respectively provided with a trapezoidal cross section structure, so that output and input of rolled pieces are facilitated, and meanwhile, cooling water can conveniently enter the inner cavity of the middle guide pipe and the inner cavity of the discharging guide pipe.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the mounting unit assembled with the cooler;

FIG. 3 is a cross-sectional view taken along line A-A of the beam of FIG. 2;

FIG. 4 is an isometric view of the water inlet manifold;

FIG. 5 is an isometric view of the cooler;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a cross-sectional view taken along line C-C of the feed guide tube of FIG. 6;

fig. 8 is a schematic structural view of the water cooling tank.

In the attached drawing, 1, a water cooling tank, 2, a tank body water inlet hole, 3, a water falling hole, 4, a cooler, 5, an installation unit, 6, a shell, 7, a feeding guide pipe, 8, a middle guide pipe, 9, a discharging guide pipe, 10, a shell water inlet hole, 11, a water inlet cavity, 12, a discharging end, 13, a water through hole, 14, an end cover, 15, a water distributing beam, 16, a pressing plate, 17, a limiting protrusion, 18, a connecting bolt, 19, a pressing bolt, 20, a through hole, 21, a water inlet distributing pipe, 22, a rotating handle, 23, a support, 24, a distributing lug, 25, a single port, 26 and multiple ports.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

In the specific embodiment, as shown in fig. 1 to 8, a cooling control device used in the production process of rolled steel bar and wire materials comprises a water cooling tank 1 and a cooling unit arranged in the water cooling tank 1, wherein both ends of the water cooling tank 1 are respectively provided with a rolled piece penetrating hole, the water cooling tank 1 is respectively provided with a tank body water inlet hole 2 and a water falling hole 3 which are matched with the cooling unit, the key is that the cooling unit comprises a group of coolers 4 which are sequentially arranged along the feeding direction of the rolled piece, namely, a rolled piece penetrates through the water cooling tank 1 and needs to pass through a plurality of coolers 4, the coolers 4 are fixedly connected with the water cooling tank 1 by virtue of an installation unit 5, the installation unit 5 can be transversely provided with a plurality of installation positions (horizontal direction perpendicular to the feeding direction of the rolled piece), so that the water cooling tank 1 can simultaneously cool a plurality of rolled pieces, the coolers 4 comprise a shell 6, and a feeding guide pipe 7, a water inlet guide pipe, a water outlet, a water, The middle guide pipe 8 and the discharge guide pipe 9 are sequentially arranged from left to right in figure 1, namely the feeding guide pipe 7, the middle guide pipe 8 and the discharge guide pipe 9, a gap is arranged between the discharge guide pipe 9 of the previous cooler 4 and the feeding guide pipe 7 of the next cooler 4, a water inlet cavity 11 connected with a water inlet 2 of the box body by a water inlet 10 of the shell body is arranged on the shell body 6, a discharge end 12 of the feeding guide pipe 7 is positioned in the water inlet cavity 11 and a gap is arranged between the discharge end 12 of the feeding guide pipe 7 and the middle guide pipe 8, the cross sections of the tail end of the water inlet cavity 11, the two ends of the inner cavity of the middle guide pipe 8 and the front end of the inner cavity of the discharge guide pipe 9 are respectively in a trapezoid structure, the lower bottoms of the two ends of the inner cavity of the middle guide pipe 8 are respectively connected with the upper bottom of the tail end of the water inlet cavity 11 and the lower bottom of the front end of the, the shorter bottom side is called as the upper bottom, so that the lower bottom is positioned on the left side and the upper bottom is positioned on the right side in the tail end (right end) of the trapezoidal structure of the water inlet cavity 11; in the left end of the trapezoidal structure of the middle guide pipe 8, the lower bottom is arranged at the left end, and the upper bottom is arranged at the right end; the middle guide tube 8 has a trapezoidal structure, wherein the upper bottom of the right end of the trapezoidal structure is arranged on the left side, and the lower bottom of the right end of the trapezoidal structure is arranged on the right side; in the front end (left end) of the discharging guide pipe 9, the lower bottom is arranged at the left, and the upper bottom is arranged at the right; the left end of the middle guide pipe 8 is attached to the tail end of the water inlet cavity 11, and the right end of the middle guide pipe 8 is attached to the front end of the discharge guide pipe 9; the front end (left end) of the water inlet cavity 11 is an annular cavity, and the water inlet 10 is arranged at the annular cavity.

Wherein, be provided with a set of reposition of redundant personnel lug 24 that are the annular array and arrange on the outer wall of feeding stand pipe 7, reposition of redundant personnel lug 24 is arranged in being the trapezium structure's of intake antrum 11 end, shunts the cooling water that gets into intake antrum 11, makes rivers more step-equally.

The outer wall of middle stand pipe 8, the outer wall of ejection of compact stand pipe 9 laminate with the inner wall of casing 6 respectively, form the supporting form of dabber, be provided with the end cover 14 supporting with ejection of compact stand pipe 9 on the casing 6, the terminal upright wall of intake antrum 11 has formed the spacing to the left end of middle stand pipe 8, end cover 14 is spacing to the right-hand member of ejection of compact stand pipe 9, end cover 14 is with the help of fixing bolt and 6 fixed connection of casing, be convenient for to middle stand pipe 8, the dismouting replacement of ejection of compact stand pipe 9. The front end of the feeding guide pipe 7 is provided with a step-shaped side wall, the front end of the shell 6 is matched with the step-shaped side wall of the feeding guide pipe 7 for limiting, and the feeding guide pipe 7 is fixedly connected with the shell 6 by means of a fixing bolt. The end cover 14, the head of the fixing bolt for fixing the end cover 14 and the head of the fixing bolt for fixing the feeding guide pipe 7 are contacted to form a gap between the discharging guide pipe 9 and the feeding guide pipe 8 between two adjacent coolers 4, particularly the contact of the head of the fixing bolt, so that the gap is communicated with the water cooling tank 1, and a rolled piece has a short cooling water-free stroke when entering the next cooler 4 from the previous cooler 4. All parts in this cooler 4 all can in time be changed according to the in-service use condition, and convenient long-term use has reduced cost of maintenance.

The outer wall of the discharge end 12 of the feeding guide pipe 7 is conical, the cross section of the conical discharge end 12 and the cross section of the water inlet cavity 11 are arranged at intervals of the trapezoidal tail ends and are parallel to each other, the distance between the conical discharge end 12 and the cross section of the water inlet cavity 11 increases the turbulence of water inlet, and the contact efficiency of cooling water and a rolled piece is further improved.

The length ratio of the coolers 4 (including the heads of the fixing bolts at two ends) to the water cooling box 1 is in the range of 1:7-1:10, the denominator is an integer, and the preferred length ratio is 1:9, namely, a rolled piece needs to pass through nine coolers 4, under the condition of the same cooling length, the number of the coolers is increased, the length of the coolers is greatly reduced, the number of water spraying times is increased, the pressure of required cooling water is remarkably reduced, and the direct contact efficiency of the cooling water and the rolled piece is improved. The rolled piece receives multi-point pressurized water cooling of the plurality of coolers 4, so that the water pressure in the coolers 4 is stable, the rolled piece is fully contacted with the water for cooling, the pressurized water in the coolers 4 with shorter length can be fully filled between the rolled piece and the inner wall of the coolers 4, the lubricating effect is achieved, and the abrasion of the inner wall of the coolers 4 in the conveying process of the rolled piece is reduced.

The mounting unit 5 comprises a water-cooling box 1 and a water-cooling beam 15, a pressure plate 16 is connected with the water-cooling box 1, a group of limiting bulges 17 matched with the shell 6 are arranged on the water-cooling beam 15 along the horizontal direction vertical to the feeding direction of a rolled piece, a clamping groove for clamping the shell 6 is formed between two adjacent

limiting bulges

17, 4 limiting bulges 17 are arranged in the embodiment, namely three coolers 4 can be transversely mounted on one water-cooling beam 15, the coolers 4 are positioned and mounted by means of the water-cooling beam 15, the pressure plate 16 is fixedly connected with the water-cooling beam 15 by means of connecting bolts 18, a compression bolt 19 matched with the shell 6 is arranged on the pressure plate 16, when the cooler 4 is mounted, the coolers 4 are sequentially placed in the clamping groove formed between the limiting bulges 17, the connecting bolts 18 are arranged on two sides of the pressure plate 16, a fixing plate matched with the connecting bolts 18 is arranged on the water-cooling beam 15, the connecting bolts 18 are rotated to enter the fixing plate to fix the, and then, the position of the compression bolt 19 in the vertical direction is continuously adjusted, so that the compression bolt 19 and the clamping groove are matched to form clamping on the cooler 4 in the vertical direction, the cooler 4 is fixed, the dismounting and the mounting are convenient, the water distribution beam 15 is provided with the water passing hole 13 which is respectively communicated with the box body water inlet hole 2 and the shell body water inlet hole 10, and the shell body water inlet hole 10 is connected with the box body water inlet hole 2 by virtue of the water passing hole 13. The inlet and the outlet of the water through hole 13 are respectively communicated with the tank body water inlet hole 2 and the shell body water inlet hole 10.

Wherein, the middle part of dividing water beam 15 is provided with the through-hole 20 parallel with the direction of setting up of spacing arch 17, and the setting of this through-hole 20 has effectively increased the heat radiating area who divides water beam 15, avoids dividing the inside heat accumulation of water beam 15 and cooler 4.

A water inlet distributing pipe 21 is arranged in the water passing hole 13, a rotating handle 22 positioned outside the water dividing beam 15 is arranged at the end part of the water inlet distributing pipe 21, and a rotary sealing ring is arranged between the rotating handle 22 and the water dividing beam 15, so that the water inlet distributing pipe 21 can rotate and water can be prevented from flowing out; a group of supports 23 of the water inlet branch pipes 21 are arranged in the water passing holes 13, the front ends of the water inlet branch pipes 21 are connected with inlets of the water passing holes 13, the water inlet branch pipes 21 are sequentially provided with single ports 25 and multiple ports 26 matched with outlets of the water passing holes 13 along the circumferential direction of the water inlet branch pipes, and as the water dividing beam 15 is provided with the three coolers 4, the water inlet branch pipes 21 are respectively provided with the single ports, the double ports (two ports of the double ports are arranged along the water inlet branch pipes 21) and the three ports (three ports of the three ports are arranged along the axis of the water inlet branch pipes 21); when single-line water passing is carried out (namely only one cooler 4 works on the water distribution beam 15), the water inlet branch pipe 21 is rotated to enable the single port on the water inlet branch pipe to correspond to the outlet of the water through hole 13 corresponding to the vertical position of the water inlet branch pipe, and the other two outlets of the water through hole 13 correspond to the side wall of the water inlet branch pipe 21; when double-line water passing (namely two coolers 4 work on the water dividing beam 15) is carried out, the water inlet dividing pipe 21 is rotated to enable the double-line ports on the water inlet dividing pipe to correspond to the outlets of the water through holes 13 corresponding to the vertical positions of the water inlet dividing pipe and the water dividing beam respectively; when the whole line water supply is carried out (the three coolers 4 on the water distribution beam 15 all work), the water inlet distribution pipe 21 is rotated to enable the three ports to respectively correspond to the outlets of the water through holes 13 corresponding to the vertical positions of the three ports, and the cooling water in the water through holes 13 can supply water to the three coolers 4; the setting of water inlet branch pipe 21 makes the utility model discloses a accuse cold charge is put has realized the multi-thread controllable operation, can carry out the single line cooling, can carry out the multi-thread cooling again, and simple structure, and it is convenient to adjust.

When the water cooling device works, cooling water is supplied into the water cooling tank 1 by external water supply equipment, enters the water through holes on the water splitting beam 15 along the water inlet hole 2 of the tank body, is sequentially supplied to the three transversely arranged coolers 4 through the water through holes, passes through the shell water inlet hole 10 through the water through holes, and immediately enters the water inlet cavity 11; the rolled piece penetrates into the cooler 4 through a penetrating hole at the left end of the water cooling tank 1, firstly passes through the feeding guide pipe 7 in the cooler 4, the cross section of the front end of the inner cavity of the feeding guide pipe 7 is of a trapezoidal structure, so that the rolled piece can conveniently enter the inner cavity of the feeding guide pipe 7, and then passes through the water inlet cavity 11, the middle guide pipe 8 and the discharging guide pipe 9 in sequence to bring cooling water in the water inlet cavity 11 into the middle guide pipe 8 and the discharging guide pipe 9; after exiting from the cooler 4 on the first water diversion beam 15 on the left, the cooling medium immediately enters the cooler 4 on the second water diversion beam 15 and is sequentially cooled in the coolers 4 arranged in sequence in the feeding direction of the rolled piece. Because the heads of the fixing bolts for mounting the end covers 14 between the coolers 4 are contacted with the heads of the fixing bolts for mounting the feeding guide pipes 7, the discharging guide pipe 9 of the previous cooler 4 and the feeding guide pipe 7 of the next cooler 4 are in a state without cooling water at intervals, when a rolled piece runs between the coolers 4, the air film disappears repeatedly by the coolers 4, and the heat exchange efficiency of the cooling water and the rolled piece is improved.

Adopt old accuse cold charge in the actual production below cool with the utility model discloses a contrast analysis is carried out to accuse cold charge refrigerated in service behavior.

This time rolling of four specifications

The steel bar has the grade number of HRB400E, the content of vanadium in the steel grade corresponding to the old cold control device in each performance comparison is 0.025-0.035%, and the content of vanadium in the steel grade controlled to be refrigerated is 0.01-0 by using the utility model015% and the specific ingredients are tabulated below:

the steel grade chemical components corresponding to the old cold control device are as follows:

C	Si	Mn	S	P	V
						0.22-0.25％	0.65-0.75％	1.4-1.5％	≤0.045	≤0.045	0.025-0.035％

the utility model discloses a steel grade chemical composition that accuse cold charge is put and is corresponded:

C	Si	Mn	S	P	V
						0.22-0.25％	0.65-0.75％	1.4-1.5％	≤0.045	≤0.045	0.01-0.015％

the indexes are compared as follows [ the statistical data is the comparison condition of the weighted average of 11 months (old cooling control device) and 12 months, 1 month and 2 months (cooling control device of the utility model) ]:

1. yield comparison

Therefore, the average daily output is improved by 561t after the cooling control device of the utility model is used;

2. hourly production and job rate comparison

The machine hour output is averagely improved by 18.48t/h after the cooling control device is used, and the calendar operation rate is averagely improved by 14.51 percent;

3. comparison of Performance

Average performance when using the old thermal control device:

use the utility model discloses an average performance during accuse cold charge is put:

although the content of vanadium in a rolled piece is reduced, the performance of the cooling control device after cooling can meet the standard requirement of GB1499.2-2018, and the uniformity is better; and in the later stage, the steel grade with the vanadium content of 0.01-0.015% is cooled by using an old cooling control device, and finally the yield strength of each diameter is lower than 400MPa, and the metallographic structure is unqualified.

4. Comparison of rolled piece curvatures

Four specifications of old cold control device

The steel bars are all wavy and bent in different degrees, the single-meter bending degree is 0.4-0.6%, the bending degree of the straight steel bars exceeds the bending degree of GB1499.2, the use is not influenced, and the total bending degree is not more than 0.4% of the total length of the steel bars, so that the later straightening is needed, and the cost input is increased; use the utility model discloses a wave bending eliminates basically behind the accuse cooling device, and the straightness has great change before, through measuring, and the single meter crookedness of reinforcing bar is less than 0.3%, and the finished product crookedness is good and need not the later stage aligning.

5. Tail to nose ratio of steel

Four specifications of old cold control device

The bending length of the head and the tail of the steel bar is about 600 mm; after the cooling control device of the utility model is used, the bending bifurcation phenomenon of the front end and the rear end of each steel stock ruler is eliminated, the bending length of the head and the tail of the steel bar is less than 200mm, and the phenomena of steel binding and steel disorder of the apron board are basically eliminated; the head aligning effect at the position of the head aligning roller way is better, the phenomenon that the production rhythm is influenced by the head aligning difference in the prior art is improved, and good conditions are provided for collecting steel in the rear area.

6. Grain size and metallographic structure comparison

After the new national standard of hot-rolled ribbed steel bars GB1499.2-2018 for reinforced concrete is implemented, clear requirements are provided for the grain size and the metallographic structure of the steel bars: the grain size of the hot-rolled steel bar is more than 9 grades, and a tempered martensite structure cannot appear on a metallographic structure base circle.

The Vickers hardness difference, the macroscopic metallographic phase, the high-power microstructure and the grain size of the old cooling control device are used (the cooling control temperature is controlled between 820 and 850 ℃): the difference between Vickers hardness and grain size exceeds the standard.

Vickers hardness test report

High power test report

Use the utility model discloses a behind the accuse cold charge device vickers hardness good, macroscopical metallography and high power microstructure, the grain size condition (accuse cold temperature control between 820 mangle 850 ℃):

vickers hardness test report

High power test report

After the cooling control device of the utility model is used, the stable production of the cooling control process of the bar HRB400/E phi 18-25mm is realized, the temperature of the upper cooling bed is controlled between 820 and 890 ℃, and the adjustment margin is larger. The quality indexes of the steel product such as performance, yield ratio, bending degree, metallographic structure and the like all meet the requirements of the GB1499.2-2018 standard, and the quality is stable.

And (3) benefit measurement:

1. energy saving and consumption reduction benefits

The three water pump motors in the cooling control area are all 315kw, two of the motors are frequency-converted (6/7 water pumps), and one is power frequency (8 water pumps).

When the old cold control device is used: during production, the water pump is started in a mode of adding a power frequency by a variable frequency, the No. 6/7 pump is started to 47 Hz, the opening degree of the valve at the inlet side of the No. 8 pump is 100%, and the opening degree of the valve at the outlet side is 55%. The water pressure is controlled to be 1.45-1.75MPa, and the flow rate is 335m 3/h.

Use the utility model discloses a behind the accuse cold charge: during production, the water pump is started in a mode of adding a power frequency by a variable frequency, the No. 6/7 pump is started to reach 40 Hz, the opening degree of the valve at the inlet side of the No. 8 pump is 100%, and the opening degree of the valve at the outlet side is 30%. The water pressure is controlled to be 0.55-1.05MPa, and the flow rate is 210m 3/h.

The reduction of pressure and flow rate can greatly reduce the power consumption, save electricity by about 1.8KWh/t per ton of steel, and the annual benefit is yield, electricity saving, and unit price of power consumption is 7.5 ten thousand tons, 12 x 1.8KWh/t x 0.486 yuan/KWh is 78.73 yuan.

2. Yield increase benefit

The yield is increased by about 561 tons per day, calculated according to the ton wood benefit of 100 yuan/ton. The annual creation benefit is 365 days, the yield increase tonnage, the average calendar operation rate and the ton benefit is 365, 561 ton, 51 percent, 100 yuan/ton, 1044.30 ten thousand yuan.

3. Yield increase benefit

The unqualified department in steel front end needs to cut 3m at least when using old accuse cold charge, uses the utility model discloses a this problem has been eliminated completely behind the accuse cold charge, only this lumber recovery rises 0.47%, and direct benefit reaches 4.3 yuan/ton. The annual benefit is 7.5 ten thousand tons × 12 × direct economic benefit is 7.5 ten thousand × 12 × 4.3 yuan/ton is 387 ten thousand yuan.

4. Steel billet alloy composition benefit

The utility model discloses a accuse cold charge has solved the curved, the performance fluctuation of finished product wave big, the metallographic structure unstable, the big problem of the adjustment degree of difficulty of wearing water, under the prerequisite of guaranteeing the quality, steel billet chemical composition has carried out the alloy and has optimized, makes steel product property ability up to standard:

the chemical components of the original steel billet are as follows:

the optimized chemical components of the steel billet are as follows:

adopt the utility model discloses a cooling device still can realize the further optimization of steel billet chemical composition, realizes not adding noble metal such as vanadium or niobium, makes steel product property ability accord with the requirement of new national standard GB/T1499.2-2018: the target chemical components of the further optimized steel billet are as follows:

C	Si	Mn	S	P
					0.22-0.25％	0.68-0.78％	1.48-1.58％	≤0.045	≤0.045

according to the average value of market prices in 10 months in 2018, when V in steel is reduced by 0.010 percent, the production cost of steel added with ferrovanadium nitride is reduced by 110 yuan/t.

The utility model discloses a utility model people found in the actual production that in a unit heat exchange system, when the flow is relatively small, the change of the flow has a great influence on the cooling effect; after the flow rate is increased to a certain value, along with the continuous increase of the flow rate, the influence on the cooling effect is gradually reduced, therefore, the multi-cooler 4 is adopted in the cooling control device for cooling step by step, the pressure required by cooling water is greatly reduced, the water pressure of about 0.35-6MP can meet the production requirement of a steel mill, compared with the pressure of 1.8MP required by traditional forced penetration, the power consumption of each ton of steel can be saved by about 1 yuan, in the actual production, the cooling amplitude of the water cooling line with the length of 12-18m reaches 400-; in the aspect of product performance, due to the reduction of the gas film, the contact between cooling water and a rolled piece is more sufficient, the boiling heat exchange coefficient is increased, the heat transfer effect is improved, the production efficiency is further improved, the martensite is completely eradicated by the high-efficiency low-consumption cooling mode, the strength and the toughness of the rolled piece are greatly improved, and the production cost is further saved on the premise of ensuring the quality.

Claims

1. The utility model provides a accuse cold charge is put in steel rolling stick wire rod production process uses, includes water-cooling tank (1) and sets up the cooling unit in water-cooling tank (1), is provided with respectively on water-cooling tank (1) with supporting box inlet opening (2) of cooling unit and hole (3) of falling into water, its characterized in that: the cooling unit include a set of cooler (4) that set gradually along the incoming direction of rolled piece, cooler (4) with the help of installation element (5) and water cooling tank (1) fixed connection, cooler (4) include casing (6), set gradually feeding guide tube (7), middle stand pipe (8) and ejection of compact stand pipe (9) in casing (6) along the incoming direction of rolled piece, ejection of compact stand pipe (9) of preceding cooler (4) and feeding guide tube (7) of the latter cooler (4) between be provided with the clearance, casing (6) on be provided with intake antrum (11) of being connected with box inlet opening (2) with the help of casing inlet opening (10), discharge end (12) of feeding guide tube (7) be located intake antrum (11) and be provided with the clearance between middle stand pipe (8), intake antrum (11) terminal, cooler (4) end, The cross sections of the two ends of the inner cavity of the middle guide pipe (8) and the front end of the inner cavity of the discharge guide pipe (9) are respectively of a trapezoidal structure, and the bottoms of the two ends of the inner cavity of the middle guide pipe (8) are respectively connected with the upper bottom of the tail end of the water inlet cavity (11) and the bottom of the front end of the inner cavity of the discharge guide pipe (9).

2. The cold control device for the production process of the rolled steel bar and wire rods according to claim 1 is characterized in that: the outer wall of the middle guide pipe (8) and the outer wall of the discharging guide pipe (9) are respectively attached to the inner wall of the shell (6), and an end cover (14) matched with the discharging guide pipe (9) is arranged on the shell (6).

3. The cold control device for the production process of the rolled steel bar and wire rods according to claim 1 is characterized in that: installation unit (5) including dividing water beam (15), clamp plate (16) be connected with water-cooling tank (1), divide water beam (15) to go up and be provided with a set of spacing arch (17) supporting with casing (6) along the horizontal direction of the feed direction of perpendicular to rolled piece, clamp plate (16) link firmly and are provided with on clamp plate (16) with the help of connecting bolt (18) and divide water beam (15) and with the supporting housing (6) clamp bolt (19), divide water beam (15) to be provided with cross water hole (13), the entry of crossing water hole (13), export link up with box inlet opening (2), casing inlet opening (10) respectively.

4. The cold control device for the production process of the rolled steel bar and wire rods according to claim 3 is characterized in that: the middle part of the water diversion beam (15) is provided with a through hole (20) which is parallel to the arrangement direction of the limiting bulge (17).

5. The cold control device for the production process of the rolled steel bar and wire rods according to claim 3 is characterized in that: the water hole (13) of crossing in be provided with into water distributing pipe (21), into water distributing pipe (21) tip is provided with and is located the outside turning handle (22) of water diversion roof beam (15), is provided with rotary seal circle between turning handle (22) and water diversion roof beam (15), crosses support (23) that are provided with a set of into water distributing pipe (21) in water hole (13), the front end of into water distributing pipe (21) and the entry linkage of crossing water hole (13), set gradually along its circumferencial direction on water distributing pipe (21) with the supporting single opening (25) and the multiport (26) of the export of crossing water hole (13).

6. The cold control device for the production process of the rolled steel bar and wire rods according to claim 1 is characterized in that: the outer wall of the discharge end (12) of the feeding guide pipe (7) is conical.

7. The cold control device for the production process of the rolled steel bar and wire rods according to claim 1 is characterized in that: the length ratio of the cooler (4) to the water cooling tank (1) is 1 (7-10).

8. The cold control device for the production process of the rolled steel bar and wire rods according to claim 1 is characterized in that: the outer wall of the feeding guide pipe (7) is provided with a group of shunting lugs (24) which are arranged in an annular array.