Wire rod intermediate rolling water cooling device

Abstract

The utility model relates to a wire rod intermediate rolling water cooling device, which is arranged on a forked guide groove between an intermediate rolling unit and a flying shear, and comprises a base, an inlet horn mouth, a spray head mounting pipe, an outlet horn mouth and a reverse blowing pipe set are arranged, the front end of the reverse blowing pipe set right faces the outlet horn mouth so that wires in the outlet horn mouth can conveniently enter a reverse blowing mounting pipe, and air holes which are supplied with air by an external air source so as to blow the wires in the reverse blowing pipe set are formed in the reverse blowing pipe set. When coiled screws of the same specification are rolled and the intermediate rolling through water cooling device is not used, six air cooling fans need to be started for cooling, so that the performance of a wire can meet the requirement, after the intermediate rolling through water cooling device is put into use, the temperature of a rolled piece is effectively controlled, the performance is improved, in the air cooling stage, only five air cooling fans need to be started, the power of a single fan is 200 KW, and the air cooling efficiency is greatly improved. It is expected that power consumption can be saved by about 150 thousand yuan every year.

Description

Technical Field

[0001] The utility model relates to the technical field of steel rolling machinery, in particular to a water cooling device for rolling through a wire rod. Background Art

[0002] There are many cooling methods in high-speed wire production, but they can be summarized into two types: conventional cooling and controlled cooling. Conventional cooling is a method of natural cooling in the surrounding environment without any control means. Controlled cooling belongs to the category of controlled rolling in the field of steel rolling. Controlled rolling refers to the rolling process that combines thermoplastic deformation with solid phase transformation through reasonable control of metal heating, deformation and temperature in hot rolling engineering to obtain fine grain structure and make steel have excellent comprehensive mechanical properties. Controlled cooling is a cooling method that uses the residual heat of rolling after hot rolling of the rolled piece to obtain the required structure and performance at a certain cooling rate (control). It refers to the control of austenite grain size and the reasonable control of cooling process parameters of the rolling process (initial cooling temperature, final cooling temperature, cooling rate) to achieve the purpose of improving the structure and performance of steel, mainly through the refinement of austenite grains, and the control and inhibition of the final ferrite grain growth and refinement process. With the development of wire rods, the final rolling temperature and final rolling speed of wire rods are constantly increasing, and the coil weight is constantly increasing, and controlled cooling is becoming more and more important. So far, there are many kinds of wire cooling process devices in the world, among which the more complete ones include the Stelmor method, the Schroeman method, the intermittent water cooling method and so on.

[0003] The water-through cooling device is an indispensable and important component in modern wire production. It is mainly used to control the temperature of the rolled piece during the rolling process and the cooling temperature of the finished product to achieve the purpose of improving product performance. Most of the domestic high-speed wire rolling post-cooling processes use water cooling from the finishing mill to the spinning mill. The purpose is to quickly cool the rolled piece from the final rolling temperature to the required spinning temperature, control the grain size of the wire austenite and reduce the generation of iron oxide scale. Usually 2~3 water tanks are set up, and a closed-loop automatic temperature control system is used to control temperature fluctuations. At present, the introduction of key equipment and water cooling models can control the spinning temperature difference to about 10°C. Water cooling can sharply reduce the wire temperature to 750~920°C, so that the fine-grained austenite structure formed after rolling can be retained after rapid cooling, providing suitable metallographic structure and temperature conditions for phase transformation, avoiding the wire staying in a high temperature state, and reducing the generation of secondary iron oxide scale. At the same time, considering the control of the temperature difference between the core surface of the wire, a temperature equalization guide groove is provided behind the water tank;

[0004] The general production process of water cooling is: after heating, the billet first enters the rough rolling unit and the intermediate rolling unit, and then enters the water tank and the water tank respectively after coming out of the pre-finishing rolling unit and the finishing rolling unit, and then the wire is spun into a coil by the wire laying machine and falls on the air cooling line, and finally enters the collection and finishing operation process. The characteristic of this process layout is that the rolled wire is cooled twice by two different cooling media (one water tank cooling, and one air cooling line air cooling), which can effectively control the decomposition temperature of austenite and achieve the organizational structure, hardening performance and physical and mechanical properties required by the finished product;

[0005] However, its disadvantages are also obvious. This is because the water cooling of the rolled piece in the water tank is to control the temperature of the rolled piece entering the finishing mill, and the water cooling of the rolled piece in the water tank is to control the wire-spinning temperature of the rolled piece. There is no cooling control device before the rolled piece enters the pre-finishing mill. When entering the pre-finishing mill, the temperature is high, the grains grow rapidly, and the grains are prone to migration and coarsening. The coarse grains will affect the mechanical properties and deformation processing properties of the material. This kind of organization reduces the strength, plasticity and toughness of the steel, reduces the fatigue performance, and increases the stress concentration and crack generation of the finished product;

[0006] Therefore, we improved the water cooling device in the factory to meet the wire cooling needs. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a wire rod rolling water cooling device with reasonable structural design and better cooling effect in view of the deficiencies in the prior art.

[0008] The technical problem to be solved by the utility model is achieved through the following technical scheme: a wire rod intermediate rolling water cooling device, which is arranged on a bifurcated guide groove between an intermediate rolling mill group and a flying shear, and comprises a base embedded in the bifurcated guide groove, on which there is;

[0009] The inlet bell mouth has a through hole in the middle for passing wires;

[0010] A nozzle installation pipe, the front end of which is directly opposite to the inlet bell mouth, so that the wire in the inlet bell mouth can enter the nozzle installation pipe, a plurality of groups of nozzles are installed in the nozzle installation pipe, and a plurality of water supply ports are provided on the outer peripheral surface of the nozzle installation pipe to supply water to the nozzles in the nozzle installation pipe, so as to cool the wire in the nozzle installation pipe;

[0011] The outlet bell mouth has a through middle and a front end facing the nozzle installation pipe, so as to facilitate the wire in the nozzle installation pipe to enter the outlet bell mouth;

[0012] The back-blowing pipe group has its front end facing the outlet bell mouth, so that the wire in the outlet bell mouth can enter the back-blowing pipe group. The back-blowing pipe group is provided with air holes supplied by an external air source to purge the wire in the back-blowing pipe group.

[0013] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned wire rod rolling water cooling device, the axes of the inlet bell mouth, the nozzle mounting pipe, the nozzle, the outlet bell mouth and the backblowing pipe group are collinear.

[0014] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned wire rod rolling water cooling device, the inner diameter of the inlet end of the inlet bell mouth is larger than the inner diameter of the outlet end.

[0015] The technical problem to be solved by the utility model can also be achieved through the following technical solutions. In the above-mentioned wire rolling water cooling device, a connecting pipe I is arranged between the inlet bell mouth and the nozzle mounting pipe, the axes of the inlet bell mouth, the nozzle mounting pipe and the connecting pipe I are collinear, and the outer peripheral surface of the inlet bell mouth, the front end face of the connecting pipe I, the rear end face of the connecting pipe I and the front end face of the nozzle mounting pipe are all connected by flanges.

[0016] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned wire rolling water cooling device, two groups of nozzles are arranged in front and behind in the nozzle installation pipe, and the front end inner diameter of the nozzle is larger than the rear end inner diameter.

[0017] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned wire rolling water cooling device, the space between the middle outer peripheral surface of the nozzle and the inner peripheral surface of the nozzle mounting tube forms a water supply space, and a plurality of spray holes are provided on the rear end outer peripheral surface of the nozzle to facilitate the water flow in the water supply space to be sprayed onto the wire.

[0018] The technical problem to be solved by the utility model can also be achieved through the following technical solutions. In the above-mentioned wire rod rolling water cooling device, a connecting pipe II is sleeved on the outer peripheral surface of the outlet bell mouth, the axis of the connecting pipe II is colinear with the axis of the outlet bell mouth, and the front end face of the connecting pipe II is connected to the rear end face of the nozzle mounting pipe by a flange.

[0019] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned wire rod rolling water cooling device, the rear end of the connecting pipe II and the front end of the backblowing pipe group are arranged at a distance.

[0020] The technical problem to be solved by the utility model can also be achieved by the following technical scheme: in the above-mentioned wire rod rolling water cooling device, the back-blowing pipe group is arranged in two groups one after the other, and each group of back-blowing pipe groups includes a back-blowing pipe and a back-blowing pressure cover;

[0021] The middle part of the back-blowing tube is through-set to facilitate the wire to pass through, the air hole is located on the outer peripheral surface of the back-blowing tube, and a purge slope I is arranged on the inner peripheral surface of the rear end of the back-blowing tube;

[0022] The middle part of the back-blowing pressure cover is through-set to facilitate the wire to pass through, the edge of the back-blowing pressure cover is screwed to the rear end face of the back-blowing pipe, and a purge slope II is fixedly provided at the middle part of the front end of the back-blowing pressure cover;

[0023] After the back-blowing cover is screwed onto the back-blowing pipe, the clearance between the purge slope I and the purge slope II is matched, and air is supplied to the air hole through an external air source, so that the air flow passes through the clearance between the purge slope I and the purge slope II to purge the moisture on the surface of the wire.

[0024] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned wire rod rolling water cooling device, the front end inner diameter of the backblowing pipe is larger than the rear end inner diameter.

[0025] Compared with the prior art, the beneficial technical effects of the utility model are:

[0026] (1) The water-through cooling device for the intermediate rolling of the wire rod is arranged after the intermediate rolling unit, that is, the water-through cooling device is added after the intermediate rolling unit, so that the temperature of the rolled piece before entering the pre-finishing rolling unit is reduced by about 50℃-80℃, which effectively controls the organizational state of the deformed austenite, prevents the growth of grains or the premature precipitation of carbides to form network carbides, fixes the dislocation caused by deformation, increases the supercooling degree of phase transformation, and makes organizational preparations for the transformation of the deformed austenite to ferrite or cementite and pearlite. In addition, the rolled piece is directly surface quenched after the intermediate rolling by water-through cooling. The surface temperature of the steel is quickly reduced to below 800℃ by tempering, and then the residual heat is transferred from the core of the rolled piece in the air, so that the temperature of the steel reaches the free tempering temperature of 850-900℃, so as to improve the strength, plasticity and toughness of the steel, and make the steel have good comprehensive properties. The ferrite grain size reaches 11 levels, and the grain size is increased by 2 levels, which improves the mechanical properties of the product, and the yield strength is increased by 15-20MPa on average. The surface bubble phenomenon is basically gone, and the qualified rate of steel performance is increased from 97.5% to 99.9%;

[0027] (2) From the perspective of reducing alloy composition, after the wire rod passes through the intermediate rolling water cooling device, it can improve the steel bar performance and reduce the alloy element content, so as to achieve the purpose of reducing production costs and increasing economic benefits. According to statistics, if the intermediate rolling water cooling process is adopted for the production of coils with the same strength level, about 2-3 yuan of manganese-carbon alloy can be saved per ton. Calculated based on the steel plant's annual output of 1 million tons of coils, it can create an economic benefit of about 2 million yuan per year;

[0028] (3) When rolling coils of the same specification, if the intermediate rolling water-through cooling device is not used, six air-cooling fans need to be turned on for cooling to ensure that the wire performance meets the requirements. After the intermediate rolling water-through cooling device is put into use, the temperature of the rolled piece is effectively controlled and the performance is improved. During the air cooling stage, only five air-cooling fans need to be turned on, with a single fan power of 200KW. It is estimated that electricity consumption can be saved by about RMB 150,000 per year. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the utility model;

[0030] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0031] Figure 3 for Figure 1 Schematic diagram of the local enlarged structure.

[0032] In the figure, 1, intermediate rolling unit; 2, forked guide groove; 3, base; 4, screw hole; 5, inlet bell mouth; 6, nozzle mounting pipe; 7, nozzle; 8, connecting pipe I; 9, outlet bell mouth; 10, connecting pipe II; 11, air hole; 12, back-blowing pipe; 13, back-blowing pressure cover; 14, purge slope I; 15, annular mounting groove; 16, purge slope II; 17, water supply port; 18, spray hole; 19, flying shear. DETAILED DESCRIPTION

[0033] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0034] Example 1, reference Figure 1-3 A wire rod intermediate rolling water cooling device is arranged on a bifurcated guide groove 2 between an intermediate rolling mill group 1 and a flying shear. The intermediate rolling mill group 1, the bifurcated guide groove 2 and the flying shear 19 are all prior art, so their specific structures are not described here. It includes a base 3 embedded in the bifurcated guide groove 2;

[0035] It should be noted that, in order to facilitate the installation of the device, we disassembled the middle part of the bifurcated guide groove 2 by about 1 meter, and then set the base in the disassembly area, so that the wire in the bifurcated guide groove 2 can be directly transported to the wire to penetrate the water cooling device;

[0036] In addition, we can set a certain number of wire-piercing water cooling devices according to the number of forked guide grooves 2, for example Figure 1 Two forked guide grooves 2 are provided in the middle, and two wire-piercing water cooling devices are provided correspondingly;

[0037] The base 3 is formed as a generally plate-like structure, on which a plurality of screw holes 4 may be provided, and on which there are;

[0038] The inlet bell mouth 5 is through-through in the middle and is formed with a circular through hole for passing the wire. The inner diameter of the inlet end of the inlet bell mouth 5 is larger than the inner diameter of the outlet end, and the specific inner diameter value can be customized according to the use requirements;

[0039] The nozzle installation tube 6 is through-through in the middle and is formed with a circular through hole. The front end of the nozzle installation tube 6 faces the inlet bell mouth 5, so that the wire in the inlet bell mouth 5 can enter the nozzle installation tube 6. Several groups of nozzles 7 are installed in the nozzle installation tube 6. Two groups of nozzles 7 in the nozzle installation tube 6 are arranged one after the other. The front end inner diameter of the nozzle 7 is larger than the rear end inner diameter. The specific inner diameter value can be customized according to the use requirements. Several water supply ports 17 are provided on the outer peripheral surface of the nozzle installation tube 6 to supply water to the nozzle 7 in the nozzle installation tube 6 so as to cool the wire in the nozzle installation tube 6;

[0040] The space between the middle outer circumference of the nozzle 7 and the inner circumference of the nozzle mounting tube 6 forms a water supply space. A plurality of spray holes 18 are provided on the rear end outer circumference of the nozzle 7 to facilitate the water flow in the water supply space to spray onto the wire. The spray holes 18 may be circular holes and may be tilted toward the center of the nozzle 7.

[0041] It should be noted that the wire can be spray-cooled by the spray hole 18 to reduce the temperature of the wire;

[0042] In addition, we can set a return pipe or return ditch under the base, and the water flow discharged from the external pressure relief can be mixed with the wire-binding circulating water and returned to the pump room to form circulating water;

[0043] A connecting pipe I8 is provided between the inlet bell mouth 5 and the nozzle mounting pipe 6. The middle of the connecting pipe I8 is penetrated and a circular through hole is formed. The axes of the inlet bell mouth 5, the nozzle mounting pipe 6 and the connecting pipe I8 are collinear. The outer peripheral surface of the inlet bell mouth 5, the front end surface of the connecting pipe I8, the rear end surface of the connecting pipe I8 and the front end surface of the nozzle mounting pipe 6 are all connected by flanges.

[0044] The outlet bell mouth 9 is through-open in the middle, and its front end faces the nozzle mounting tube 6, so as to facilitate the wire in the nozzle mounting tube 6 to enter the outlet bell mouth 9;

[0045] A connecting pipe II 10 is sleeved on the outer circumferential surface of the outlet bell mouth 9, the middle of the connecting pipe II 10 is penetrated and a circular through hole is formed, the axis of the connecting pipe II 10 is collinear with the axis of the outlet bell mouth 9, the front end face of the connecting pipe II 10 is connected to the rear end face of the nozzle mounting pipe 6 through a flange, and the rear end of the connecting pipe II 10 is spaced from the front end of the backflush pipe group, and the purpose of the spacing is to facilitate the water in the outlet bell mouth 9 to flow out from the spacing, thereby relieving pressure;

[0046] A back-blowing pipe group, the front end of which is directly opposite to the outlet bell mouth 9, so that the wire in the outlet bell mouth 9 can enter the back-blowing pipe group, and an air hole 11 is provided on the back-blowing pipe group for supplying air from an external air source to purge the wire in the back-blowing pipe group;

[0047] The back-blowing pipe group is provided in two groups, one in front and one behind, and each group of back-blowing pipe group includes a back-blowing pipe 12 and a back-blowing pressure cover 13;

[0048] The middle part of the backblowing tube 12 is through-set to facilitate the passage of the wire, the air hole 11 is located on the outer peripheral surface of the backblowing tube 12, and a purge slope Ⅰ14 is provided on the inner peripheral surface of the rear end of the backblowing tube 12. The inclination angle of the purge slope Ⅰ14 can be selected according to the use requirements, for example, an angle between 20° and 30° with the horizontal plane. The inner diameter of the front end of the backblowing tube 12 is larger than the inner diameter of the rear end, and the specific inner diameter value can be customized according to the use requirements;

[0049] In order to facilitate the installation of the back-blowing tube 12 group on the top surface of the base 3, we open an annular mounting groove 15 on the middle outer peripheral surface of the back-blowing tube 12 of the back-blowing tube 12 group, and the back-blowing tube 12 is limited on the top surface of the base 3 by a U-shaped plate (not shown in the figure, its structure is roughly U-shaped, inverted and nested in the annular mounting groove 15 when in use, and then bolted to the top surface of the base 3 by bolt fasteners) and the U-shaped plate is fixed to the base 3 by bolt fasteners, so that the installation of the back-blowing tube 12 can be completed;

[0050] The middle part of the back-blowing pressure cover 13 is through-set to facilitate the wire to pass through. The edge of the back-blowing pressure cover 13 is screwed to the rear end face of the back-blowing pipe 12. A purge slope II 16 is fixedly provided in the middle part of the front end of the back-blowing pressure cover 13. The purge slope II 16 is parallel to the purge slope I 14.

[0051] After the back-blowing cover 13 is screwed onto the back-blowing pipe 12, the clearance between the purge slope Ⅰ14 and the purge slope Ⅱ16 is matched, and air is supplied to the air hole 11 through an external air source, so that the air flow passes through the clearance between the purge slope Ⅰ14 and the purge slope Ⅱ16 to purge the moisture on the surface of the wire;

[0052] It should be noted that the air holes 11 are used to purge the wires in the back-blowing tube 12 group. On the one hand, the wires can be cooled by high-speed airflow, and on the other hand, water on the surface of the wires can be purged to prevent the cooling water from passing out with the wires.

[0053] The axes of the inlet bell mouth 5, the nozzle mounting pipe 6, the nozzle 7, the outlet bell mouth 9 and the back-blowing pipe 12 are collinear.

[0054] When the wire rod rolling water cooling device is in use:

[0055] After the wire rod passes through the intermediate rolling mill 1, for example, the wire rod with a material shape of φ30mm, a speed of 6m / s, and a temperature of 950°C, before entering the forked guide groove 2, the wire rod first enters the inlet bell mouth 5, and enters the nozzle installation pipe 6 from the inlet bell mouth 5. The water supply pipe such as an external water tank supplies high-pressure cooling water to the water supply port 17 on the nozzle installation pipe 6, and the water pressure is 2.4MPa, so that the water flows through the spray hole 18 to cool the wire rod. At this time, the wire rod enters the nozzle installation pipe 6 To the outlet bell mouth 9, the return water is depressurized and enters the back-blowing pipe 12 group from the outlet bell mouth 9. At this time, the air hole 11 on the back-blowing pipe 12 is supplied with air through the external compressed air source equipment, so that the high-speed airflow is used to purge the wire in the back-blowing pipe 12 and the water on the outer peripheral surface of the wire is swept down, which plays a water sealing role while cooling, preventing the cooling water from passing through the guide groove with the rolled piece. After the rolled piece passes through the water cooling device during the intermediate rolling, the temperature drops to 850℃-900℃, and then enters the pre-finishing rolling unit.

Claims

1. A wire rod intermediate rolling water cooling device, which is arranged on the bifurcated guide groove between the intermediate rolling mill group and the flying shear, characterized in that: It includes a base embedded in the bifurcated guide groove, and has; The inlet bell mouth has a through hole in the middle for passing wires; A nozzle installation pipe, the front end of which is directly opposite to the inlet bell mouth, so that the wire in the inlet bell mouth can enter the nozzle installation pipe, a plurality of groups of nozzles are installed in the nozzle installation pipe, and a plurality of water supply ports are provided on the outer peripheral surface of the nozzle installation pipe to supply water to the nozzles in the nozzle installation pipe, so as to cool the wire in the nozzle installation pipe; The outlet bell mouth has a through middle and a front end facing the nozzle installation pipe, so as to facilitate the wire in the nozzle installation pipe to enter the outlet bell mouth; The back-blowing pipe group has its front end facing the outlet bell mouth, so that the wire in the outlet bell mouth can enter the back-blowing pipe group. The back-blowing pipe group is provided with air holes supplied by an external air source to purge the wire in the back-blowing pipe group.

2. A wire rod rolling water cooling device according to claim 1, characterized in that: The axes of the inlet bell mouth, the nozzle mounting pipe, the nozzle, the outlet bell mouth and the back-blowing pipe group are collinear.

3. A wire rod rolling water cooling device according to claim 1, characterized in that: The inner diameter of the inlet end of the inlet bell mouth is larger than the inner diameter of the outlet end.

4. A wire rod rolling water cooling device according to claim 1, characterized in that: A connecting pipe I is arranged between the inlet bell mouth and the nozzle mounting pipe, the axes of the inlet bell mouth, the nozzle mounting pipe and the connecting pipe I are collinear, and the outer peripheral surface of the inlet bell mouth, the front end face of the connecting pipe I, the rear end face of the connecting pipe I and the front end face of the nozzle mounting pipe are all connected by flanges.

5. The wire rod rolling water cooling device according to claim 1, characterized in that: There are two groups of nozzles in the nozzle installation pipe, one in front and one behind, and the inner diameter of the front end of the nozzle is larger than the inner diameter of the rear end.

6. A wire rod rolling water cooling device according to claim 1, characterized in that: The space between the middle outer circumference of the nozzle and the inner circumference of the nozzle mounting tube forms a water supply space, and a plurality of spray holes are provided on the rear end outer circumference of the nozzle to facilitate the water flow in the water supply space to spray onto the wire.

7. A wire rod rolling water cooling device according to claim 1, characterized in that: A connecting pipe II is sleeved on the outer peripheral surface of the outlet bell mouth, the axis of the connecting pipe II is colinear with the axis of the outlet bell mouth, and the front end face of the connecting pipe II is connected to the rear end face of the nozzle installation pipe through a flange.

8. A wire rod rolling water cooling device according to claim 7, characterized in that: The rear end of the connecting pipe II is spaced apart from the front end of the back-blowing pipe group.

9. The wire rod rolling water cooling device according to claim 1, characterized in that: The back-blowing pipe group is provided in two groups, one in front and one behind, and each group of back-blowing pipe group includes a back-blowing pipe and a back-blowing pressure cover; The middle part of the back-blowing tube is through-set to facilitate the wire to pass through, the air hole is located on the outer peripheral surface of the back-blowing tube, and a purge slope I is arranged on the inner peripheral surface of the rear end of the back-blowing tube; The middle part of the back-blowing pressure cover is through-set to facilitate the wire to pass through, the edge of the back-blowing pressure cover is screwed to the rear end face of the back-blowing pipe, and a purge slope II is fixedly provided at the middle part of the front end of the back-blowing pressure cover; After the back-blowing cover is screwed onto the back-blowing pipe, the clearance between the purge slope I and the purge slope II is matched, and air is supplied to the air hole through an external air source, so that the air flow passes through the clearance between the purge slope I and the purge slope II to purge the moisture on the surface of the wire.

10. The wire rod rolling water cooling device according to claim 1, characterized in that: The inner diameter of the front end of the backflush tube is larger than that of the rear end.

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