Mixed loading variable step pitch method for square billets with different sections of walking beam furnace

Abstract

The invention discloses a step-variable mixed loading method for square billets with different sections of a walking beam furnace, which comprises the following steps of: firstly, determining a reasonable steel billet interval range greater than or equal to 70mm of different blank types, and determining a step range of the different blank types; and after the step range is determined, amplifying 2-3 times of the small step into the large step. The device is used for mixed loading of square billets with different sections of the steel rolling walking beam furnace, the loading amount and the heating efficiency of the heating furnace with more sections are greatly improved, the productivity is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the field of steel, and in particular to a method for mixing and changing the step distance of square billets with different sections in a walking beam heating furnace. Background Art

[0002] The distribution of billets on the walking beam in the steel rolling walking heating furnace must be kept at a certain interval to ensure heating on all four sides. At the same time, the spacing of the billets must be reasonable. Too large a spacing will affect the loading capacity, while too small a spacing will not only affect the heating effect, but also for the side-in and side-out heating furnace, the rollers may scratch the adjacent billets during feeding and discharging.

[0003] Therefore, when designing a heating furnace, the step size of each step needs to be determined according to the cross-sectional size of the billet to be produced. Since steel rolling heating furnaces often have a variety of cross-sections and billet types, if a single step size is used, the loading capacity of small billets will be low, affecting heating efficiency and production efficiency, and increasing energy consumption. If multiple step sizes are used, how to choose so that the heating furnace can be loaded with steel at the same time during mixed loading, and the billet on the steel-out side just steps onto the furnace roller to meet the conditions for steel-out so that production can continue has become a difficult problem that needs to be solved.

[0004] Therefore, it is necessary to develop a new method for mixed loading of billets with different cross-sections in a walking beam heating furnace to increase the loading capacity and reduce energy consumption. Summary of the invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a method for variable step distance of mixed loading of billets with different cross-sections in a walking beam heating furnace, which is used for mixed loading of billets with different cross-sections in a steel rolling walking beam heating furnace, greatly improving the loading capacity and heating efficiency of heating furnaces with more production cross-sections, increasing production capacity and reducing energy consumption.

[0006] Technical solution: A method for varying the step distance of mixed loading of billets of different cross-sections in a walking beam heating furnace of the present invention is characterized in that: firstly, a reasonable billet spacing range of different billet types is determined to be ≥70 mm, and then the step distance range of different billet types is determined; after determining the step distance range, the small step distance is enlarged by 2-3 times as the large step distance.

[0007] Wherein, when the steel billet is a mixture of a 150mm square billet and a 250mm×300mm billet, the step range of the 150mm square billet is ≥220mm.

[0008] The horizontal placement step range of the 250mm×300mm blank is ≥370mm.

[0009] Among them, three step lengths can be selected: 125mm, 250mm, and 375mm.

[0010] Wherein, when the 250mm×300mm billet is loaded and discharged separately, a step distance of 375mm is used.

[0011] Wherein, when the 150 mm square billet is charged and discharged separately, a step distance of 250 mm is used.

[0012] Among them, when the steel is loaded and discharged for different billet shapes, a step distance of 125mm is used for transition, a 150mm square billet is loaded in 2 steps, and a 250mm×300mm billet is discharged in 3 steps.

[0013] Among them, a 250mm×300mm billet can be loaded in 3 steps, and a 150mm square billet can be produced in 2 steps.

[0014] Among them, the method is used for mixed loading of billets with different cross-sections in a walking beam heating furnace with variable step distances.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention adopts a variety of step distances and reasonably selects the step distance when mixing different sections, cleverly ensuring that the step distance when loading steel and the step distance when tapping steel are perfectly matched, thereby achieving steel loading and tapping at the same time, increasing the loading capacity of the walking beam heating furnace during mixed loading, improving thermal efficiency and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a usage state diagram of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] The step-by-step method for mixed loading of billets with different cross-sections in a walking beam heating furnace of the present invention first determines that the reasonable spacing range of billets with different billet shapes is ≥70mm, and then determines the step-by-step range of billets with different billet shapes. When the billets are mixed loading of billets with cross-sections of 150mm and 250mm×300mm, the step-by-step range of the 150mm billet shape is ≥220mm, and the step-by-step range of the 250mm×300mm billet shape is ≥370mm.

[0019] After determining the step range, enlarge the small step by 2-3 times to get the large step. Three step sizes are available: 125mm, 250mm, and 375mm. 1) When loading and tapping 250mm×300mm billets separately, use a 375mm step. 2) When loading and tapping 150mm square billets separately, use a 250mm step. 3) When loading and tapping different billets, use a 125mm step transition, load a 150mm square billet in 2 steps, tap a 250mm×300mm billet in 3 steps; or load a 250mm×300mm billet in 3 steps, tap a 150mm square billet in 2 steps.

[0020] The method is used for mixed loading of billets with different cross-sections in a walking beam heating furnace with variable step distances. The present invention adopts a variety of step distances, reasonably selects the step distance when mixing billets with different cross-sections, and cleverly ensures that the step distance when loading steel and the step distance when tapping steel are perfectly matched, thereby achieving steel loading and tapping at the same time, increasing the loading capacity of the walking beam heating furnace during mixed loading, improving thermal efficiency, and reducing energy consumption.

Claims

1. A method for mixing and changing the step distance of billets with different cross sections in a walking beam heating furnace, characterized in that: First determine that the reasonable billet spacing range for different billet types is ≥70mm, and determine the step range for different billet types; after determining the step range, enlarge the small step by 2-3 times to get the large step.

2. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 1, characterized in that: When the steel billet is a mixed billet with a cross section of 150 mm and a billet with a cross section of 250 mm×300 mm, the step range of the 150 mm square billet is ≥220 mm.

3. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 2, characterized in that: The horizontal placement step range of the 250mm×300mm blank is ≥370mm.

4. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 3, characterized in that: Three step lengths are available: 125mm, 250mm, and 375mm.

5. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 4, characterized in that: When the 250mm×300mm billet is loaded and discharged separately, a step distance of 375mm is used.

6. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 4, characterized in that: When the 150 mm square billet is loaded and discharged separately, a step distance of 250 mm is used.

7. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 4, characterized in that: When loading and discharging steel of different billet shapes, use a step distance of 125mm for transition, load a 150mm square billet in 2 steps, and discharging a 250mm×300mm billet in 3 steps.

8. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to claim 7, characterized in that: Or a 250mm×300mm billet is loaded in 3 steps, and a 150mm square billet is produced in 2 steps.

9. The method for mixed loading of billets with different cross sections in a walking beam heating furnace according to any one of claims 1 to 8, characterized in that: The method is used for mixed loading of billets with different cross sections in a walking beam heating furnace with variable step length.

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