Method and device for increasing the temperature of a billet before it is introduced into a furnace

Abstract

The application discloses a method for improving billet charging temperature, and belongs to the technical field of steel smelting, which solves the problem that the existing steel mill actively sends billets, which easily leads to long billet residence time on the conveying roller and large billet temperature loss. The method is to obtain the demand state of the rolling mill for the billets, and the steel mill arranges to send billets or arranges the billets to be offline and stacked according to the demand state. The method can prevent the billets from stopping on the conveying roller and causing excessive temperature loss, and effectively improves the billet charging temperature. The application also discloses a device for improving billet charging temperature, which comprises a counter, an audible and visual alarm and a controller. The counter is installed on a chain elevator below the conveying roller, the controller and the audible and visual alarm are both installed in the steel mill, and the counter and the audible and visual alarm are both electrically connected with the controller. The device can play a role in billet heat preservation, and is very convenient to maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel smelting, more particularly, it relates to a method and device for improving the temperature of billets entering a furnace. BACKGROUND

[0002] In a steel smelting enterprise, the billets between the steel mill and the rolling mill are generally transported by a roller, a cross-car or a car, among which the roller transportation is mainly economic and efficient. After the billets are discharged from the steel continuous casting machine, they usually have a high temperature, so they are usually arranged on the conveying roller immediately, and are sent to the heating furnace of the rolling mill in groups and batches. The billets are usually arranged by the steel mill according to the production rhythm of the steel continuous casting machine, and the hot billets are arranged on the conveying roller first. When the conveying roller is full of a group of billets, the conveying roller is started to send the billets to the rolling mill, and the billets are sent into the heating furnace by the chain elevator. In this way, the billets are continuously transported, and the remaining billets of the steel continuous casting machine are arranged offline by the workers and are stored.

[0003] The disadvantages of the above operation are:

[0004] When the production rhythm of the rolling mill is adjusted or abnormal, the previous billets will stay on the conveying roller for too long, resulting in a large temperature loss during the conveying of the billets, and thus increasing the gas consumption of the heating furnace.

[0005] Therefore, a method and device for improving the temperature of billets entering a furnace are provided. SUMMARY

[0006] The technical problem to be solved by the present application is to solve the above-mentioned deficiencies of the prior art. The first object of the present application is to provide a method for improving the temperature of billets entering a furnace, which prevents the problem of excessive temperature loss caused by the stagnation of billets on the conveying roller, effectively improves the temperature of billets entering the furnace, and reduces the gas consumption of the heating furnace of the rolling mill.

[0007] The second object of the present application is to provide a device for improving the temperature of billets entering a furnace, which plays a role in heat preservation of the billets and is very convenient to maintain.

[0008] In order to achieve the above-mentioned first object, the present application provides a method for improving the temperature of billets entering a furnace, which obtains the demand state of the rolling mill for billets, and arranges the billets to be sent or arranges the billets to be sent offline and stacked according to the demand state.

[0009] As a further improvement, the demand state refers to the sound and light alarm signal sent by the steel mill when the chain elevator of the rolling mill lifts the Nth billet of each group;

[0010] When the steel mill receives the sound and light alarm signal, the worker arranges the billets to be sent.

[0011] When the steel plant does not receive an audible and visual alarm signal, the staff will arrange for the billets to be removed from the production line and stacked.

[0012] Furthermore, the Nth steel billet is obtained by calculating using the following formula:

[0013] t1 = L / V

[0014] t2=k*t3

[0015] N=(t2-t1) / t3

[0016] Where L is the length of the conveyor rollers; V is the speed of the conveyor rollers; t1 is the conveying time of a group of steel billets; k is the number of steel billets in each group; t3 is the lifting time of a single steel billet; and t2 is the lifting time of a group of steel billets.

[0017] When N is less than or equal to zero, N takes the value 1;

[0018] When N is greater than zero, N is rounded to the right.

[0019] Furthermore, it also includes video monitoring of the chain elevators in the rolling mill and transmitting the video interface to the steelmaking plant.

[0020] Furthermore, the number of steel billets lifted by the chain hoist to the Nth billet in each group is obtained by counting with a counter.

[0021] To achieve the second objective mentioned above, the present invention provides a device for increasing the temperature of steel billets entering the furnace, comprising a counter, an audible and visual alarm, and a controller. The counter is installed on a chain elevator below the conveyor roller conveyor, and the controller and the audible and visual alarm are both installed in the steelmaking plant. The counter and the audible and visual alarm are electrically connected to the controller.

[0022] As a further improvement, a camera and a display are also included. The camera is installed in the rolling mill above the chain hoist, and the display is installed in the steelmaking plant. Both the camera and the display are electrically connected to the controller.

[0023] Furthermore, the conveyor roller is also covered with a heat insulation component, which includes a protective shell and heat insulation cotton. The protective shell is a rectangular structure with openings at both ends, and the rectangular protective shell is fitted around the outer periphery of the conveyor roller. The heat insulation cotton is filled into the inner wall of the protective shell.

[0024] Furthermore, the protective shell comprises a bottom shell and several top shells. The bottom shell is fixedly connected to the conveyor rollers, and each top shell is hinged to the bottom shell on one side and movably overlapped on the bottom shell on the other side.

[0025] Further, the inner wall top of both ends of the protective shell is respectively provided with a first temperature sensor and a second temperature sensor, and the first temperature sensor and the second temperature sensor are electrically connected with the controller 。

[0026] Advantages

[0027] Compared with the prior art, the present application has the advantages of:

[0028] 1. The method of the present application adjusts the existing steel billet sending mode of the steel mill according to the demand state of the rolling mill, and when the rolling mill needs steel billets, the demand information is fed back to the steel mill, and the steel mill arranges to send steel billets, otherwise arranges the steel billets to be offline and stacked, prevents the problem of excessive temperature loss caused by the stagnation of steel billets on the conveying roller, effectively improves the steel billet temperature, and reduces the coal gas consumption of the heating furnace of the rolling mill.

[0029] 2. The device of the present application can meet the demand of sending steel billets according to the demand of the rolling mill, and can also play a role in heat preservation and conveying of steel billets on the conveying roller, further improve the steel billet temperature, and facilitate maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 The structure of the present application is shown in the figure;

[0031] Fig. 2 The main structure of the protective shell in the present application is shown in the enlarged schematic view;

[0032] Fig. 3 The side structure of the protective shell in the present application is shown in the enlarged schematic view.

[0033] Wherein: 1-Counter, 2-Acousto-optic alarm, 3-Controller, 4-Conveying roller, 5-Chain elevator, 6-Steel mill, 7-Camera, 8-Display, 9-Rolling mill, 10-Protective shell, 11-Heat insulation cotton, 12-First temperature sensor, 13-Second temperature sensor, 14-Steel mill continuous casting machine, 15-Heating furnace, 101-Bottom shell, 102-Top shell. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the specific embodiments in the drawings.

[0035] Reference Figs. 1-3 A method for improving the steel billet temperature, the method is to obtain the demand state of the rolling mill for steel billets, and the steel mill arranges to send steel billets or arranges steel billets to be offline and stacked according to the demand state.

[0036] The method of the present application adjusts the existing steel billet sending mode of a steel mill according to the demand state of a rolling mill, feeds back the demand information to the steel mill when the rolling mill needs steel billets, and arranges the steel billet sending by the steel mill, or arranges the steel billet offline and stacking, so as to prevent the problem of excessive temperature loss caused by the billet stagnation on the conveying roller, effectively improve the billet charging temperature, and reduce the gas consumption of the heating furnace of the rolling mill.

[0037] Specifically, the demand state refers to that when the chain elevator of the rolling mill lifts the Nth steel billet of each group, the steel mill sends out an audible and visual alarm signal;

[0038] When the steel mill receives the audible and visual alarm signal, the staff arranges the steel billet sending;

[0039] When the steel mill does not receive the audible and visual alarm signal, the staff arranges the steel billet offline and stacking.

[0040] Wherein, the Nth steel billet is obtained by the following formula:

[0041] t1=L / V

[0042] t2=k*t3

[0043] N=(t2-t1) / t3

[0044] Wherein, L is the length of the conveying roller; V is the speed of the conveying roller; t1 is the conveying time of a group of steel billets; k is the number of steel billets in each group; t3 is the lifting time of a single steel billet; t2 is the lifting time of a group of steel billets;

[0045] When N is less than or equal to zero, N takes the value 1;

[0046] When N is greater than zero, N takes the right integer.

[0047] In one embodiment, when N is 0, N=1, that is, the conveying time t1 of a group of steel billets is the same as the lifting time t2 of a group of steel billets, when the chain elevator lifts the first steel billet of each group, the steel mill sends out an audible and visual alarm signal, and the staff of the steel mill arranges the steel billet sending, when the chain elevator just finishes lifting a group of steel billets, the next group of steel billets is just conveyed from the conveying roller to the chain elevator, realizing the continuity of the continuous steel billet sending, conveying and lifting.

[0048] In another embodiment, when N is negative, N=1, that is, the conveying time t1 of a group of steel billets is greater than the lifting time t2 of a group of steel billets, when the chain elevator lifts the first steel billet of each group, the steel mill sends out an audible and visual alarm signal, and the staff of the steel mill arranges the steel billet sending, when the chain elevator finishes lifting a group of steel billets, the next group of steel billets is still being conveyed on the conveying roller, and will not cause the steel billet stagnation and temperature loss.

[0049] In another embodiment, when N is 1.2, then N = 2, that is, the conveying time t1 of a group of billets is less than the lifting time t2 of a group of billets, when the chain elevator lifts the second billet of each group, then the sound and light alarm signal is sent in the steel plant, the staff of the steel plant arranges to send billets, when the chain elevator finishes lifting a group of billets, the next group of billets is still being conveyed in the conveying roller way, which will not cause the billets to stop and cause temperature loss. In this embodiment, the strategy of taking N to the right is adopted, which can prevent the next group of billets from being conveyed to the chain elevator while the chain elevator is still in the process of lifting the billets, which can cause the problem of billet collision.

[0050] The method of the present application also includes video monitoring of the chain elevator of the rolling mill and transmitting the video interface to the steel plant, which facilitates the staff of the steel plant to observe the lifting of the billets in real time. Preferably, the lifting of the chain elevator to the Nth billet of each group is obtained by counting through a counter, which facilitates the calculation of the billets.

[0051] A device for improving the temperature of billets into the furnace, comprising a counter 1, an audible and light alarm 2 and a controller 3, wherein the counter 1 is installed on the chain elevator 5 below the conveying roller way 4, for detecting the number of billets lifted by the chain elevator 5, the controller 3 and the audible and light alarm 2 are both installed in the steel plant 6, specifically, the controller 3 and the audible and light alarm 2 are both installed near the side of the steel continuous casting machine 14, which facilitates the operation of the staff and timely reminds the staff, the counter 1, the audible and light alarm 2 are both electrically connected with the controller 3, realizing circuit connection.

[0052] The device also comprises a camera 7 and a display 8, wherein the camera 7 is installed above the chain elevator 5 in the rolling mill 9, and the display 8 is installed in the steel plant 6, specifically, the display is installed above the side of the steel continuous casting machine 14, which facilitates the staff to watch, the camera 7 and the display 8 are both electrically connected with the controller 3, realizing circuit connection.

[0053] Preferably, the conveying roller 4 is also covered with a heat preservation assembly, which comprises a protective shell 10 and heat insulation cotton 11, wherein the protective shell 10 is a rectangular structure with open ends, and the rectangular protective shell 10 is sleeved on the periphery of the conveying roller 4, that is, the conveying roller 4 can convey the billets in the protective shell 10, and the heat insulation cotton 11 is filled in the inner wall of the protective shell 10, the billets are covered with the heat preservation assembly, the time of the billets exposed is reduced, and the billets can be heat preserved. Further, the protective shell 10 comprises a bottom shell 101 and a plurality of top shells 102, wherein the bottom shell 101 is fixedly connected with the conveying roller 4, each top shell 102 is hingedly connected with the bottom shell 101 on one side and movably lapped on the bottom shell 101 on the other side, when maintenance is needed, any top shell 102 is opened to maintain the specified position of the conveying roller 4, and the maintenance is more convenient.

[0054] The device of the present application can meet the demand of the steel rolling plant and can heat preserve the billets on the conveying roller 4, further improve the billet temperature entering the furnace, and facilitate the maintenance.

[0055] Preferably, the inner wall top of the two ends of the protective shell 10 is respectively provided with a first temperature sensor 12 and a second temperature sensor 13, the first temperature sensor 12 and the second temperature sensor 13 are electrically connected with the controller 3, the two temperature sensors can detect the temperature of the two ends of the protective shell 10 respectively and display the temperature on the display 8, the workers can understand the temperature loss of the billets on the conveying roller 4 by comparing the difference between the two temperature sensors, and provide a reference for the gas consumption of the subsequent heating furnace 15.

[0056] The above is only the preferred embodiment of the present application, it should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of variations and improvements can be made, which will not affect the effect of the present application and the practicability of the patent.

Claims

1. A method for increasing the temperature of steel billets entering the furnace, characterized in that, This method involves obtaining the demand status of steel billets from the rolling mill, and the steelmaking plant arranging the delivery of steel billets or arranging for steel billets to be removed from the production line and stacked according to the demand status. The demand status refers to the time when the chain elevator of the rolling mill lifts the Nth steel billet of each group, at which point the steelmaking plant issues an audible and visual alarm signal. When the steel plant receives an audible and visual alarm signal, the staff arranges for the delivery of steel billets; When the steel plant does not receive an audible and visual alarm signal, the staff will arrange for the billets to be taken off the production line and stacked. The Nth steel billet is obtained by the following formula: t1=L / V t2=k*t3 N = (t2 - t1) / t3 Where L is the length of the conveyor rollers; V is the speed of the conveyor rollers; t1 is the conveying time of a group of steel billets; k is the number of steel billets in each group; t3 is the lifting time of a single steel billet; and t2 is the lifting time of a group of steel billets. When N is less than or equal to zero, N takes the value 1; When N is greater than zero, N is rounded to the right.

2. The method for increasing the furnace temperature of steel billets according to claim 1, characterized in that, It also includes video monitoring of the chain elevators in the rolling mill and transmitting the video interface to the steelmaking plant.

3. The method for increasing the furnace temperature of steel billets according to claim 1, characterized in that, The chain hoist lifts the Nth steel billet of each group by counting using a counter.

4. An apparatus for implementing the method for increasing the furnace temperature of a steel billet as described in claim 1, characterized in that, It includes a counter (1), an audible and visual alarm (2), and a controller (3). The counter (1) is installed on a chain elevator (5) below the conveyor roller (4). The controller (3) and the audible and visual alarm (2) are both installed in the steel plant (6). The counter (1) and the audible and visual alarm (2) are both electrically connected to the controller (3).

5. The apparatus for increasing the furnace temperature of a steel billet according to claim 4, characterized in that, It also includes a camera (7) and a display (8), the camera (7) being installed in the steel rolling mill (9) above the chain hoist (5), and the display (8) being installed in the steelmaking plant (6), both of which are electrically connected to the controller (3).

6. The apparatus for increasing the furnace temperature of a steel billet according to claim 4 or 5, characterized in that, The conveyor roller (4) is also covered with a heat insulation component, which includes a protective shell (10) and heat insulation cotton (11). The protective shell (10) is a rectangular structure with openings at both ends, and the rectangular protective shell (10) is fitted around the outer periphery of the conveyor roller (4). The heat insulation cotton (11) is filled in the inner wall of the protective shell (10).

7. The apparatus for increasing the furnace temperature of a steel billet according to claim 6, characterized in that, The protective shell (10) includes a bottom shell (101) and several top shells (102). The bottom shell (101) is fixedly connected to the conveyor roller (4). Each top shell (102) is hinged to the bottom shell (101) on one side and movably overlapped on the bottom shell (101) on the other side.

8. The apparatus for increasing the furnace temperature of a steel billet according to claim 6, characterized in that, The top of the inner walls at both ends of the protective shell (10) are respectively provided with a first temperature sensor (12) and a second temperature sensor (13), and the first temperature sensor (12) and the second temperature sensor (13) are electrically connected to the controller (3).

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