Water tank structure, bar rolling production line and production method

Abstract

The invention discloses a water tank structure which comprises a tank body, and a forward air blowing nozzle, a plurality of water cooling nozzles, a plurality of reverse water blowing nozzles and a plurality of reverse air blowing nozzles which are arranged in the tank body and sequentially mounted in the rolling direction, and the nozzles are arranged on the two sides of a rolling line; compressed air nozzles are respectively arranged at the downstream of the last group of water cooling nozzles, the downstream of the last group of back flushing water nozzles, between two adjacent groups of back flushing water nozzles and between two adjacent groups of back flushing air nozzles. The invention further discloses a bar rolling production line and a production method. The device has the beneficial effects that the special compressed air nozzle is additionally arranged, after a rolled piece is discharged from the water cooling nozzle, compressed air in the compressed air nozzle is sprayed to water flow on the surface of the rolled piece, the water flow direction on the surface of the rolled piece is changed, water stopping of the back flushing water nozzle is facilitated, and the water yield brought by a bar is reduced; and the compressed air nozzle is additionally arranged at the outlet of the water tank, so that residual water caused by unsmooth surface of the deformed steel bar can be cleaned, and the amount of water brought out by the bar is reduced.

Description

Technical Field

[0001] The present invention relates to the field of iron and steel metallurgical production and manufacturing, and in particular to a water tank structure, a bar rolling production line and a production method. Background Art

[0002] At present, there are basically two types of water-penetrating cooling methods used in the industry, one is the water tank type (represented by Danieli), and the other is the open type (represented by Morgan). The water tank type water-penetrating cooling method does not change when dealing with steel piles and replacing nozzles, but it is difficult to quickly clean up scrap steel when dealing with steel pile accidents, while the open type water-penetrating cooling method can achieve the result of quickly processing scrap steel, so many manufacturers now use the open type water-penetrating cooling method.

[0003] However, due to the use of an open water-through cooling method and the limitation of processing precision, it is difficult to ensure that the sealing and water flow control between the various components of the equipment are in an ideal state during manufacturing. At the same time, during long-term use, the surface of the equipment is worn due to water erosion and other reasons, making it very easy to carry water during the water-through process. The large amount of water carrying phenomenon then causes a large amount of fog, which quickly spreads, causing the entire factory to be shrouded in water mist. This not only interferes with the stability of on-site thermal detection signal detection, causing deviations in detection data or failure to obtain normal data, affecting product quality control, but also brings considerable safety hazards to the production site. Summary of the invention

[0004] The purpose of the present invention is to provide a water tank structure, a bar rolling production line and a production method to reduce the amount of water brought out of the water tank by the bars, in view of the deficiencies in the prior art.

[0005] The technical solution adopted by the present invention is: a water tank structure, including a tank body, and a forward blowing nozzle, a plurality of water cooling nozzles, a plurality of reverse blowing water nozzles and a plurality of reverse blowing air nozzles arranged in the tank body and installed in sequence along the rolling direction, each nozzle is arranged on both sides of the rolling line; compressed air nozzles are respectively arranged downstream of the last group of water cooling nozzles, downstream of the last group of reverse blowing water nozzles, between two adjacent groups of reverse blowing water nozzles, and between two adjacent groups of reverse blowing air nozzles; the angle between the jet direction of the compressed air nozzle and the rolling direction is 30 to 60 degrees.

[0006] According to the above scheme, the angle between the jet direction of the compressed air nozzle and the rolling direction is 30-60°; the pressure of the compressed air nozzle is 0.6-1.0 MPa.

[0007] According to the above scheme, the annular gap of the forward blowing nozzle is 0.3-0.7 mm, the annular gap of the water cooling nozzle is 0.8-1.2 mm, the annular gap of the reverse blowing water nozzle is 1.3-1.7 mm, and the annular gap of the reverse blowing air nozzle is 0.3-0.7 mm.

[0008] The present invention also adopts a rolling production line for preventing bars from carrying water, comprising a rough rolling mill group, an intermediate rolling mill group, a pre-finishing rolling mill group, a first water tank arranged in sequence along the rolling direction, and a rolling channel A and a rolling channel B arranged downstream of the first water tank; the A rolling channel and the B rolling channel have the same configuration, and each respectively comprises a first finishing rolling mill group, a second water tank, a second finishing rolling mill group, and several groups of third water tanks arranged in sequence; the first water tank, the second water tank and the third water tank each comprise several sections of the water tank structure as described above which are connected in series in sequence, and the back-blowing water nozzle of the water tank structure is connected to the water supply main outside the water tank structure.

[0009] According to the above scheme, the first water tank includes four water tank structures connected in series, namely water tank No. 1, water tank No. 2 and water tank No. 3; the second water tank includes two water tank structures, namely water tank No. 4 and water tank No. 5; the third water tank includes two water tank structures, namely water tank No. 6 and water tank No. 7.

[0010] The present invention also adopts a rolling production line for preventing bars from carrying water, comprising a roughing mill group, an intermediate rolling mill group, a pre-finishing rolling mill group, a first water tank arranged in sequence along the rolling line, and a C rolling channel arranged downstream of the first water tank, wherein the C rolling channel comprises a finishing mill group and a fourth water tank; the first water tank and the fourth water tank both comprise a plurality of sections of the water tank structure as described above which are connected in series in sequence, and the back-blowing water nozzle of the water tank structure is connected to a water supply main outside the water tank structure.

[0011] According to the above scheme, the first water tank includes three water tank structures described in Section 1, namely water tank No. 1, water tank No. 2 and water tank No. 3; the fourth water tank includes two water tank structures described in Section 1, namely water tank No. 8 and water tank No. 9.

[0012] The present invention also adopts a bar production method using the rolling production line as described above, wherein the bars with specifications of Φ12 to 22 are rolled in sequence by a rough rolling mill, an intermediate rolling mill and a pre-finishing rolling mill, cooled by a first water tank, and then cut into two sub-bars, which enter rolling channel A and rolling channel B respectively, are rolled by a first finishing rolling mill in rolling channel A and rolling channel B, are cooled by a second water tank, enter a second finishing rolling mill for finishing rolling, and are finally cooled by a third water tank.

[0013] According to the above scheme, for bars with steel grade 400E and specifications of Φ12, Φ14 and Φ16, during rolling production, the flow rates of the first water tank No. 1 and No. 2 are both 80-150m 3 , water outlet pressure ≤5Bar; flow rate of No. 3 water tank ≤20m 3 , water outlet pressure ≤ 2Bar; the flow rate of water tank No. 6 and water tank No. 7 is 70~110m 3 , the water outlet pressure is ≤5Bar;

[0014] For bars with steel grade 400E and specifications of Φ18, Φ20 and Φ22, during rolling production: the flow rates of water tanks 1, 2 and 3 are all 60-90m 3 , the water outlet pressure is ≤5Bar; the flow rate of water tank No. 6 and water tank No. 7 is 30~60m 3 , water outlet pressure ≤4Bar;

[0015] For steel grades of 500E and above, and bars of Φ12 and Φ14, during rolling production: the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of water tank No. 3 is 100~150m 3 , water outlet pressure ≤5Bar; flow rates of water tank No. 6 and water tank No. 7 are both 50~70m 3 , water outlet pressure is ≤4Bar;

[0016] For steel grades of 500E and above, and bars with a specification of Φ16, during rolling production: the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of water tank No. 3 is 80~120m 3 , water outlet pressure ≤5Bar; flow rate of No. 6 and No. 7 water tanks are ≤20m 3 , water outlet pressure is ≤2Bar;

[0017] For bars with steel grades of 500E and above and specifications of Φ18, Φ20, and Φ22, during rolling production: the flow rate of water tanks 1 to 3, as well as water tanks 6 and 7, is ≤20m 3 , water outlet pressure ≤2Bar.

[0018] The present invention also adopts a bar production method using the rolling production line as described above, characterized in that the bar with a specification of Φ25-40 is rolled by a rough rolling mill, an intermediate rolling mill, and a pre-finishing rolling mill, and then cooled by a first water tank, and directly enters the C rolling channel without being cut, and is rolled by a finishing rolling mill in the C rolling channel, and finally cooled by a fourth water tank to complete the rolling;

[0019] For bars with steel grade 400E and specifications of Φ25, Φ28, Φ32, Φ36 and Φ40, during rolling production: the flow rates of water tanks 1, 2 and 3 are all 80-100m 3 , the water outlet pressure is ≤4Bar; the flow rate of water tank No. 8 and water tank No. 9 is 70~100m 3 , water outlet pressure is ≤5Bar;

[0020] For bars with steel grades of 500E and above and specifications of Φ25, Φ28 and Φ32, during rolling production, the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of No. 3 water tank is ≤100~150m 3 , water outlet pressure ≤5Bar;

[0021] The flow rates of water tank No. 8 and No. 9 are both 50-70m 3 , water outlet pressure is ≤4Bar;

[0022] For bars with steel grades of 500E and above and specifications of Φ36 and Φ40, during rolling production, the flow rates of water tanks 1, 2, 3, 8 and 9 are all ≤20m 3 , the water outlet pressure is ≤2Bar.

[0023] The beneficial effects of the present invention are:

[0024] 1. Each water tank in the prior art has 2 back-blowing water nozzles and 2 back-blowing air nozzles. Since the surface of the rebar has transverse ribs, the residual water on the surface of the rebar cannot be completely cleaned by only back-blowing water and back-blowing air nozzles. The water tank structure in the present invention adds a special compressed air nozzle. After the rolled piece exits the water cooling nozzle, the compressed air in the compressed air nozzle sprays the water flow on the surface of the rolled piece, changing the direction of the water flow on the surface of the rolled piece, which helps the back-blowing water nozzle to stop water and reduces the amount of water brought out by the rod; a group of compressed air nozzles is also added at the outlet of the water tank to clean the residual water due to the rough surface of the rebar, reducing the amount of water brought out by the rod, and then reducing the impact of the brought-out water on the surrounding environment on site and the heat detection signal after the water tank.

[0025] 2. The rolling production line and production method of the present invention adopt the above-mentioned water tank structure and formulate a corresponding water tank control model according to the production specifications and steel types: under the premise of meeting the process temperature, the cooling water flow and outlet pressure of each water tank are limited, which can effectively ensure that the residual water sprayed onto the surface of the rolled piece by the water-cooling nozzle will not be brought out of the water tank after the back-blowing water and back-blowing air are purged.

[0026] 3. In the prior art, the water tank pipe network is connected from the external water supply pipe to the water inlet pipe inside the water tank, and then to the water cooling nozzle through the branch pipe in turn, and finally to the backwash water nozzle. In production, due to the influence of rolling specifications, steel types, cooling control models, and water pressure and flow fluctuations in the production line system, the backwash water stopping effect of the water tank is unstable, and the water tank cannot be completely effective. In the rolling production line of the present invention, the cooling water of the backwash water nozzle in each water tank is directly connected from the external water supply pipe, and the water pressure is controlled at 8 to 10 Bar, which can avoid the influence of changes in rolling specifications, steel types, and cooling control models. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the water tank structure in the present invention.

[0028] Figure 2 It is a schematic diagram of the layout of the rolling production line in the present invention.

[0029] Figure 3 It is a schematic diagram of the pipeline connection of each nozzle in the present invention.

[0030] Among them: 1. Box; 2. Positive air blowing nozzle; 3. Water cooling nozzle; 4. Back-blowing water nozzle; 5. Back-blowing air nozzle; 6. Compressed air nozzle; 7. Roughing mill; 8. Intermediate rolling mill; 9. Pre-finishing mill; 10. First water tank; 11. First finishing mill; 12. Second water tank; 13. Second finishing mill; 14. Third water tank; 15. Finishing mill; 16. Fourth water tank;

[0031] Water inlet main line; 17. Water supply main line; 18. Compressed air pipeline. DETAILED DESCRIPTION

[0032] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] like Figure 1 A water tank structure shown is specifically a water tank structure for water-penetrating rolling of bars, comprising a tank body 1, and a positive air blowing nozzle 2, a plurality of water cooling nozzles 3, a plurality of reverse water blowing nozzles 4 and a plurality of reverse air blowing nozzles 5 which are arranged in the tank body 1 and are sequentially installed along the rolling direction, and each nozzle is arranged on both sides of the rolling line;

[0034] Compressed air nozzles 6 are respectively arranged downstream of the last group of water cooling nozzles 3, downstream of the last group of back-blowing water nozzles 4, downstream of the last group of back-blowing water nozzles 4, between two adjacent groups of back-blowing water nozzles 4, and between two adjacent groups of back-blowing air nozzles 5;

[0035] The included angle between the jetting direction of the compressed air nozzle 6 and the rolling direction is 30-60°.

[0036] Preferably, the pressure of the compressed air nozzle 6 is 0.6-1.0 MPa.

[0037] In the present invention, a compressed air nozzle 6 is added to the last group of water-cooling nozzles 3. After the workpiece (i.e., the rod) exits the water-cooling nozzle 3, the compressed air nozzle 6 sprays compressed air toward the surface of the workpiece at an angle of 30 to 60 degrees, and the water flow sprayed toward the surface of the workpiece changes the direction of the water flow on the surface of the workpiece, which helps the back-blowing water nozzle 4 to stop water; compressed air nozzles 6 are added above each group of back-blowing water nozzles 4 and back-blowing air nozzles 5 and at the water tank outlet, and are arranged along both sides of the rolling line, and are aligned with the rolling line at an angle of 30 to 60 degrees. The pressure range is controlled at 0.6 to 1.0 MPa, and is used to blow away residual water on the surface of the workpiece.

[0038] In the present invention, there are five groups of compressed air nozzles 6, four groups of water cooling nozzles 3, two groups of back-blowing water nozzles 4, and two groups of back-blowing air nozzles 5. Each group of nozzles is symmetrically arranged on both sides of the rolling line.

[0039] In the present invention, each nozzle uses the Morgan sixth-generation nozzle, which is a split nozzle, that is, it is composed of two sub-nozzles. The annular gap of the nozzle is adjustable. When the back-blowing water nozzle 4 and the back-blowing air nozzle 5 are installed, sealant is applied on the split contact surfaces of the two sub-nozzles.

[0040] In the present invention, the annular gap of the positive air nozzle 2 is 0.3-0.7 mm, the annular gap of the water cooling nozzle 3 is 0.8-1.2 mm, the annular gap of the reverse water nozzle 4 is 1.3-1.7 mm, and the annular gap of the reverse air nozzle 5 is 0.3-0.7 mm; the setting of the annular gap of each nozzle meets the requirement that the cooling water pressure meets 1.1-1.3 Bar. Water enters from the water inlet end of each nozzle and is sprayed out at the annular gap. The sprayed water is in a circular ring shape. The flow rate and pressure of the nozzle outlet can be adjusted by adjusting the size of the annular gap.

[0041] like Figure 2 As shown, a rolling production line for preventing bars from carrying water comprises a rough rolling mill group 7, an intermediate rolling mill group 8, a pre-finishing rolling mill group 9, a first water tank 10, which are sequentially arranged along the rolling direction, and a rolling channel A and a rolling channel B arranged downstream of the first water tank 10; the rolling channel A and the rolling channel B have the same configuration, and each comprises a first finishing mill group 11, a second water tank 12, a second finishing mill group 13 and a third water tank 14; the first water tank 10, the second water tank 12 and the third water tank 14 each comprise a plurality of sections of the water tank structure as described above which are sequentially connected in series, and the back-blowing water nozzle 4 of the water tank structure is connected to a water supply main 17 outside the water tank structure.

[0042] In the present invention, the roughing mill group 7 includes 6 roughing mills, the intermediate rolling mill group 8 includes 4 intermediate rolling mills, the pre-finishing mill group 9 includes 6 pre-finishing mills, the first finishing mill group 11 includes 2 finishing mills, and the second finishing mill group 13 includes 4 finishing mills; the first water tank 10 includes three sections of the water tank structure as described above, specifically water tank No. 1, water tank No. 2 and water tank No. 3; the second water tank 12 includes two sections of the water tank structure as described above, specifically water tank No. 4 and water tank No. 5; the third water tank 14 includes two sections of the water tank structure as described above, specifically water tank No. 6 and water tank No. 7.

[0043] In the present invention, the A rolling channel and the B rolling channel are mainly used to produce threaded steel bars with specifications of Φ12 to 22. The two rolling channels have the same configuration and are used for simultaneous cutting and rolling in production.

[0044] like Figure 2 A rolling production line for preventing bars from carrying water is shown, comprising a roughing mill group 7, an intermediate rolling mill group 8, a pre-finishing rolling mill group 9, a first water tank 10 arranged in sequence along the rolling line, and a C rolling channel arranged downstream of the first water tank 10, the C rolling channel comprising a finishing mill group 15 and a fourth water tank 16; the first water tank 10 and the fourth water tank 16 both comprise a plurality of sections of the water tank structure as described above which are connected in series in sequence, and the back-blowing water nozzle 4 of the water tank structure is connected to a water supply main 17 outside the water tank structure.

[0045] In the production line containing a C rolling channel in the present invention, the roughing mill group 7 includes 6 roughing mills, the intermediate rolling mill group 8 includes 4 intermediate rolling mills, the pre-finishing mill group 9 includes 6 pre-finishing mills, and the finishing mill group 15 includes 2 finishing mills; the fourth water tank 16 includes two sections of the water tank structure as described above, specifically referring to water tank No. 8 and water tank No. 9.

[0046] In the present invention, the C rolling channel is mainly used for producing threaded steel bars with specifications of Φ25 to 40, and is single-line rolling without cutting rolling.

[0047] In the present invention, rolling channel A, rolling channel B and rolling channel C are combined, sharing the roughing mill group 7, the intermediate rolling mill group 8, the pre-finishing mill group 9 and the first water tank 10, to form a three-channel high-speed bar rolling production line.

[0048] In the present invention, in order to ensure stable backwash water pressure and good water stopping effect, the cooling water of the backwash water nozzle 4 of each water tank is directly connected from the water supply pipe 17 outside the water tank, and the water inlet pressure of the water tank is 8-10 Bar.

[0049] The present invention specifies different water tank control models according to the specifications and steel types of the finished product, i.e., the bars. A method for producing bars using the rolling production line as described above (i.e., the AB rolling channel), the method being: bars with specifications of Φ12 to 22 are successively rolled by the rough rolling unit 7, the intermediate rolling unit 8, and the pre-finishing rolling unit 9, cooled by the first water tank 10, and then cut into two sub-bars, and then enter the A rolling channel and the B rolling channel respectively, and are respectively rolled by the first finishing rolling unit 11 in the A rolling channel and the B rolling channel, and then cooled by the second water tank 12 before entering the second finishing rolling unit 13 for finishing rolling, and finally cooled by the third water tank 14; each water tank accurately controls the flow and pressure parameters of the water tank according to the preset water tank cooling control model to ensure that no water is carried after the rolled piece exits the water tank, as shown in Table 1:

[0050] For bars with steel grade 400E and specifications of Φ12, Φ14 and Φ16, during rolling production, the flow rates of the No. 1 and No. 2 water tanks of the first water tank 10 (i.e., the total flow rate of the water cooling nozzle 3 in the water tank structure, excluding the flow rate of the back-blowing water nozzle 4, the same below) are both 80-150m 3 , water outlet pressure (i.e. water outlet pressure of water tank structure, the same below) ≤5Bar; flow rate of No. 3 water tank ≤20m 3 , water outlet pressure ≤ 2Bar; the flow rate of water tank No. 6 and water tank No. 7 is 70~110m 3 , the water outlet pressure is ≤5Bar;

[0051] For bars with steel grade 400E and specifications of Φ18, Φ20 and Φ22, during rolling production: the flow rates of water tanks 1, 2 and 3 are all 60-90m 3 , the water outlet pressure is ≤5Bar; the flow rate of water tank No. 6 and water tank No. 7 is 30~60m 3 , water outlet pressure ≤4Bar;

[0052] For steel grades of 500E and above, and bars of Φ12 and Φ14, during rolling production: the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of water tank No. 3 is 100~150m 3 , water outlet pressure ≤5Bar; flow rates of water tank No. 6 and water tank No. 7 are both 50~70m 3 , water outlet pressure is ≤4Bar;

[0053] For steel grades of 500E and above, and bars with a specification of Φ16, during rolling production: the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of water tank No. 3 is 80~120m 3 , water outlet pressure ≤5Bar; flow rate of No. 6 and No. 7 water tanks are ≤20m3 , water outlet pressure is ≤2Bar;

[0054] For bars with steel grades of 500E and above and specifications of Φ18, Φ20, and Φ22, during rolling production: the flow rate of water tanks 1 to 3, as well as water tanks 6 and 7, is ≤20m 3 , water outlet pressure ≤2Bar.

[0055] A bar production method using the rolling production line as described above, the method comprising: after the bars with specifications of Φ25 to 40 are rolled by a rough rolling unit 7, an intermediate rolling unit 8, and a pre-finishing rolling unit 9, they are cooled by a first water tank 10, directly enter the C rolling channel without cutting, are rolled by a finishing rolling unit 15 in the C rolling channel, and finally are cooled by a fourth water tank 16 to complete the rolling; the water tanks before entering the finishing rolling unit 15 and after finishing rolling are precisely controlled according to a preset water tank cooling control model to ensure that no water is carried after the rolled pieces exit the water tanks, as shown in Table 2:

[0056] For bars with steel grade 400E and specifications of Φ25, Φ28, Φ32, Φ36 and Φ40, during rolling production: the flow rates of water tanks 1, 2 and 3 are all 80-100m 3 , the water outlet pressure is ≤4Bar; the flow rate of water tank No. 8 and water tank No. 9 is 70~100m 3 , water outlet pressure is ≤5Bar;

[0057] For bars with steel grades of 500E and above and specifications of Φ25, Φ28 and Φ32, during rolling production, the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of No. 3 water tank is ≤100~150m 3 , water outlet pressure ≤5Bar;

[0058] The flow rates of water tank No. 8 and No. 9 are both 50-70m 3 , water outlet pressure is ≤4Bar;

[0059] For bars with steel grades of 500E and above and specifications of Φ36 and Φ40, during rolling production, the flow rates of water tanks 1, 2, 3, 8 and 9 are all ≤20m 3 , the water outlet pressure is ≤2Bar.

[0060] Table 1 Water tank control model using A rolling channel and B rolling channel (pressure refers to water pressure)

[0061]

[0062] Table 2 Water tank control model using C rolling channel (pressure refers to water pressure)

[0063]

[0064] In the present invention, the number of nozzles opened in each water tank is required to be: when the flow rate of the water tank is ≤100m 3 When the water tank flow rate is 100-150m 3 When the water tank flow rate is greater than 150m 3 When all water cooling nozzles 3, back-blowing water nozzles 4 and back-blowing air nozzles 5 are turned on.

[0065] In the present invention, Figure 3 As shown, the forward air blowing nozzle 2, the reverse air blowing nozzle 5 and the compressed air nozzle 6 of the water tank structure are respectively connected to the external compressed air pipeline 18; each water-cooling nozzle 3 of the water tank structure is supplied with water through the water inlet main pipeline inside the water tank, and the water inlet main pipeline 16 inside the water tank is connected to the water supply main pipeline 17 outside the water tank; the reverse water blowing nozzle 4 of each water tank structure is directly connected to the water supply main pipeline 17 outside the water tank through a pipeline, and water is directly taken from the external water supply main pipeline 17 and connected to the reverse water blowing nozzle 4.

[0066] In the present invention, the structure and function of each rolling unit are prior art and will not be described in detail here.

[0067] Embodiment 1

[0068] The applicant adopted the rolling production line of the present invention to produce bars with specifications of Φ16, Φ18, Φ20, Φ22, and Φ25 in March 2024, with a cumulative output of 79,000 tons. There was no water in the water tank and no thermal detection signal failure that month.

[0069] Embodiment 2

[0070] The applicant adopted the rolling production line of the present invention to produce bars of 7 specifications, including Φ16, Φ18, Φ20, Φ22, Φ25, Φ28 and Φ32, in April 2024, with a cumulative output of 56,000 tons. There was no water in the water tank and no thermal detection signal failure that month.

[0071] Embodiment 3

[0072] The applicant used the rolling production line of the present invention to produce bars of 9 specifications, including Φ12, Φ14, Φ16, Φ18, Φ20, Φ22, Φ25, Φ28 and Φ32, in May 2024, with a cumulative output of 98,000 tons. There was no water in the water tank and no thermal detection signal failure that month.

[0073] Aiming at the characteristics of water-penetrating rolling of bars and according to the cooling control requirements of rolled pieces of different specifications and materials, the present invention designs a water tank structure that is compatible with the rods, designs the nozzle structure layout, nozzle gap and water pressure, and designs a corresponding rolling production line, production method and water tank cooling control model based on the water tank structure. This can effectively prevent the residual water on the rolled edge surface from being brought out of the water tank after the bars are water-penetrating, thereby preventing the brought-out water from affecting the thermal detection signal of the downstream frame, and at the same time can also achieve clean production of the channel line.

[0074] The present invention provides a method for preventing water from being carried by the water tank during water-penetrating rolling of bars. According to statistics, since its implementation, water has not been carried by the water tank during the production process, and the number of rolling line failures caused by water affecting the heat detection signal failure has been reduced from 1.5 times / month to 0 times / month, which can effectively ensure smooth production, improve the production rhythm of the bar production line, reduce the production of bars, and improve the core competitiveness of the production line. Under existing production conditions, it is not necessary to make major changes to the production equipment and process flow to meet the needs, it is easy to operate, and the effect of use is good.

[0075] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0076] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water tank structure, characterized in that: It includes a box body, and a forward blowing nozzle, a plurality of water cooling nozzles, a plurality of reverse blowing water nozzles and a plurality of reverse blowing air nozzles which are arranged in the box body and installed in sequence along the rolling direction, and each nozzle is arranged on both sides of the rolling line; compressed air nozzles are respectively arranged downstream of the last group of water cooling nozzles, downstream of the last group of reverse blowing water nozzles, between two adjacent groups of reverse blowing water nozzles, and between two adjacent groups of reverse blowing air nozzles.

2. The water tank structure according to claim 1, characterized in that: The included angle between the jetting direction of the compressed air nozzle and the rolling direction is 30-60°; the pressure of the compressed air nozzle is 0.6-1.0 MPa.

3. The water tank structure according to claim 1, characterized in that: The annular gap of the forward air blowing nozzle is 0.3-0.7 mm, the annular gap of the water cooling nozzle is 0.8-1.2 mm, the annular gap of the reverse water blowing nozzle is 1.3-1.7 mm, and the annular gap of the reverse air blowing nozzle is 0.3-0.7 mm.

4. A rolling production line for preventing bars from carrying water, characterized in that: It includes a rough rolling mill group, an intermediate rolling mill group, a pre-finishing rolling mill group, a first water tank, and rolling channels A and B arranged downstream of the first water tank. The A rolling channel and the B rolling channel have the same configuration, and each includes a first finishing mill group, a second water tank, a second finishing mill group, and several groups of third water tanks arranged in sequence. The first water tank, the second water tank and the third water tank each include several sections of the water tank structure as claimed in claim 1 which are connected in series in sequence, and the back-blowing water nozzle of the water tank structure is connected to the water supply main outside the water tank structure.

5. The rolling production line for preventing bars from being waterlogged as claimed in claim 4, characterized in that: The first water tank includes four water tank structures connected in series, namely water tank No. 1, water tank No. 2 and water tank No. 3; the second water tank includes two water tank structures, namely water tank No. 4 and water tank No. 5; the third water tank includes two water tank structures, namely water tank No. 6 and water tank No.

7.

6. A rolling production line for preventing water from entering the bar, characterized in that: It includes a roughing mill group, an intermediate rolling mill group, a pre-finishing rolling mill group, a first water tank, and a C rolling channel arranged downstream of the first water tank. The C rolling channel includes a finishing mill group and a fourth water tank. The first water tank and the fourth water tank each include a plurality of sections of the water tank structure as described in claim 1 that are connected in series in sequence, and the back-blowing water nozzle of the water tank structure is connected to a water supply main outside the water tank structure.

7. The rolling production line for preventing water from entering the bar according to claim 6, characterized in that: The first water tank includes three water tank structures described in Section 1, namely water tank No. 1, water tank No. 2 and water tank No. 3; the fourth water tank includes two water tank structures described in Section 1, namely water tank No. 8 and water tank No.

9.

8. A method for producing bars using the rolling production line according to claim 5, characterized in that: The bars with specifications of Φ12~22 are rolled in the roughing mill, the intermediate rolling mill and the pre-finishing mill in sequence, cooled in the first water tank, and then cut into two sub-bars. The two sub-bars enter the A rolling channel and the B rolling channel respectively, are rolled in the A rolling channel and the B rolling channel by the first finishing mill, are cooled in the second water tank, and then enter the second finishing mill for finishing rolling, and are finally cooled in the third water tank.

9. The rod production method according to claim 8, characterized in that: For bars with steel grade 400E and specifications of Φ12, Φ14 and Φ16, during rolling production, the flow rates of the first water tank No. 1 and No. 2 are both 80-150m 3 , water outlet pressure ≤5Bar; flow rate of No. 3 water tank ≤20m 3 , water outlet pressure ≤2Bar; flow rates of water tanks 6 and 7 are both 70~110m 3 , the water outlet pressure is ≤5Bar; For bars with steel grade 400E and specifications of Φ18, Φ20 and Φ22, during rolling production: the flow rates of water tanks 1, 2 and 3 are all 60-90m 3 , the water outlet pressure is ≤5Bar; the flow rate of water tank No. 6 and water tank No. 7 is 30~60m 3 , water outlet pressure ≤4Bar; For steel grades of 500E and above, and bars of Φ12 and Φ14, during rolling production: the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of water tank No. 3 is 100~150m 3 , water outlet pressure ≤5Bar; flow rates of water tank No. 6 and water tank No. 7 are both 50~70m 3 , water outlet pressure is ≤4Bar; For steel grades of 500E and above, and bars with a specification of Φ16, during rolling production: the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of water tank No. 3 is 80~120m 3 , water outlet pressure ≤5Bar; flow rate of No. 6 and No. 7 water tanks are ≤20m 3 , water outlet pressure is ≤2Bar; For bars with steel grades of 500E and above and specifications of Φ18, Φ20, and Φ22, during rolling production: the flow rate of water tanks 1 to 3, as well as water tanks 6 and 7, is ≤20m 3 , water outlet pressure ≤2Bar.

10. A method for producing bars using the rolling production line according to claim 7, characterized in that: After the bars with specifications of Φ25-40 are rolled by the rough rolling unit, the intermediate rolling unit, and the pre-finishing rolling unit, they are cooled in the first water tank and directly enter the C rolling channel without cutting. In the C rolling channel, they are rolled by the finishing rolling unit and finally cooled in the fourth water tank to complete the rolling. For bars with steel grade 400E and specifications of Φ25, Φ28, Φ32, Φ36 and Φ40, during rolling production: the flow rates of water tanks 1, 2 and 3 are all 80-100m 3 , the water outlet pressure is ≤4Bar; the flow rate of water tank No. 8 and water tank No. 9 is 70~100m 3 , water outlet pressure is ≤5Bar; For bars with steel grades of 500E and above and specifications of Φ25, Φ28 and Φ32, during rolling production, the flow rates of water tanks 1 and 2 are both ≤20m 3 , the water outlet pressure is ≤2Bar; the flow rate of No. 3 water tank is ≤100~150m 3 , water outlet pressure ≤5Bar; The flow rates of water tank No. 8 and No. 9 are both 50-70m 3 , water outlet pressure is ≤4Bar; For bars with steel grades of 500E and above and specifications of Φ36 and Φ40, during rolling production, the flow rates of water tanks 1, 2, 3, 8 and 9 are all ≤20m 3 , the water outlet pressure is ≤2Bar.

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