Round tube blank hot feeding and hot charging device for rolling steel tube

Abstract

The utility model discloses a round tube blank hot delivery and hot charging device for rolling a steel tube, which comprises a heat preservation heating box arranged at the rear part of an automobile, heat preservation bricks are paved on the inner wall of the heat preservation heating box, an upper cover of the heat preservation heating box can be opened and closed, and one or more burners are respectively arranged on the four inner walls of a box body arranged at the rear part of the automobile. Each burner is connected with an energy source of the heating device through a pipeline; a through long boss is arranged at the bottom in the heat preservation heating box and used for being matched with a groove in the bottom of the blank frame; the blank frame is in the shape of an inverted trapezoid, lifting lugs are arranged on the two side walls of the blank frame, a plurality of through holes are formed in the two side walls provided with the lifting lugs, and two lifting columns are symmetrically arranged at the upper positions of the middles of the other two side walls of the blank frame respectively. The utility model aims to solve the problems that the quality of a final steel pipe is seriously influenced as serious shrinkage cavities and center looseness are formed after the continuous casting billet is solidified and cooled to the room temperature, and impurities and alloy elements are concentrated in a core part.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe production, in particular to a device for hot conveying and hot loading of round pipe blanks used for rolling steel pipes. Background Art

[0002] At present, the steelmaking continuous casting production line and the seamless steel pipe hot rolling production line are generally arranged at a certain distance. The production process before the perforation process of the seamless steel pipe is that the round tube billet produced by continuous casting is cooled after cutting. After the round tube billet is cooled to room temperature, it is pulled to the seamless steel pipe production site by car, and then the round tube billet is cut into fixed lengths with a tube billet saw. After that, the round tube billet enters the annular heating furnace for heating. After the round tube billet is heated, it is taken out of the furnace and enters the front desk of the perforation process to prepare for perforation. Before the round tube billet is perforated and rolled, there is a process of cooling and heating the hot tube billet, which will have an adverse effect on the energy consumption of the process and the quality of the steel pipe.

[0003] At present, the steel pipe industry is promoting disruptive process innovation and green development, and is facing the problem of poor quality of the core and inner wall of the tube billet, which needs to be solved as a priority. First, the quality of the core of the tube billet is poor. After the continuous casting billet solidifies and cools to room temperature, serious shrinkage holes and central looseness are formed. Impurities and alloy elements are concentrated in the core, which seriously affects the quality of the final steel pipe; second, the quality of the inner wall is poor. Because the core of the continuous casting billet that is heated after cooling has quality defects such as looseness and segregation, the steel pipe has cracked before the head arrives, causing defects such as folding and cracking of the inner wall, which reduces the quality of the inner wall and seriously affects the overall performance and bearing capacity of the steel pipe. At the same time, reheating the continuous casting billet for perforation and rolling after cooling requires additional energy supply. This results in high cost, high consumption, poor quality and low efficiency. Utility Model Content

[0004] The utility model aims to provide a device for hot delivery and hot loading of round tube billets for rolling steel pipes. The hot round billets just produced by continuous casting are directly loaded into a car after being hot cut into fixed lengths. The car is equipped with a heating and heat preservation device. The hot round billets are transported to the steel pipe production line and then heated and rolled. In this way, the problem of serious shrinkage cavities and central looseness formed after the continuous casting billets solidify and cool to room temperature, and impurities and alloy elements are concentrated in the core, which seriously affects the quality of the final steel pipe is avoided.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model discloses a device for hot delivery and hot loading of round tube billets for rolling steel tubes, comprising a heat preservation and heating box arranged at the rear of a car, the inner wall of the heat preservation and heating box is paved with heat preservation bricks, the upper cover of the heat preservation and heating box can be opened and closed, one or more burners are respectively arranged on the four inner walls of the box body arranged at the rear of the car, and each of the burners is connected to the energy source of the heating device through a pipeline;

[0007] The bottom of the heat preservation and heating box is provided with a long boss, which is used to fit into the groove at the bottom of the blank frame, so as to stabilize the blank during transportation;

[0008] The shape of the blank frame is an inverted trapezoid, which is convenient for loading and dumping round blanks. Lifting ears are provided on the two side walls of the blank frame, and multiple through holes are provided on the two side walls with the lifting ears to facilitate heating of the round blanks. Two lifting columns are symmetrically provided in the middle and upper positions of the other two side walls of the blank frame.

[0009] Furthermore, the upper cover is in the form of a double door, and the opening and closing are controlled by two hydraulic cylinders respectively, so as to facilitate the loading and unloading of the blank frame into and out of the thermal insulation heating box. The rear end of the hydraulic cylinder is connected to the fixed bracket on the car through a rotating hinge.

[0010] Furthermore, the upper cover is provided with a lifting ring, and the upper cover is opened and closed by a crane, and a support frame is provided underneath the upper cover when the upper cover is opened.

[0011] Furthermore, the energy source of the heating device is hydrogen energy or methanol energy.

[0012] Furthermore, a buffer elastic pad is provided on the support frame.

[0013] Furthermore, the buffer elastic pad is a rubber pad.

[0014] A hot delivery and hot loading method of a device for hot delivery and hot loading of round tube billets for rolling steel tubes, comprising:

[0015] During production, the hot round billets just produced by continuous casting are hot cut into multiple hot round billets of fixed length, and then transported to the side of the material rack by the conveying roller and turned into the material rack by the turning mechanism. At this time, the crane equipped with a shovel fork shovels the hot round billets in the material rack to the top of the billet frame and pours them into the billet frame; another crane hangs the fixed hanger to hang the hanging column of the billet frame and lifts the billet frame into the heat preservation and heating box at the rear of the car, and the crane leaves with the fixed hanger and closes the upper cover of the box;

[0016] During the process of transporting the hot round billets by car, the heating device is started to continue heating the round billets; after the car arrives at the steel pipe rolling site, the upper cover of the box is opened, and the large hook of the double-hook crane hangs the fixed lifting device to lift the billet frame in the insulation heating box to the top of the hot round billet loading platform in front of the annular heating furnace, and the small hook of the crane hangs the wire rope and drops it to the lifting ear and then lifts it up, and dumps the round billets in the billet frame onto the round billet loading platform in front of the annular furnace; then, the round billets are loaded into the annular heating furnace, and then the subsequent rolling process is carried out.

[0017] Compared with the prior art, the beneficial technical effects of the utility model are:

[0018] The utility model can greatly reduce the production energy consumption of hot-rolled steel pipes and improve the inner surface quality of steel pipe products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 The utility model is a schematic structural diagram of a device for hot conveying and hot loading of round tube billets for rolling steel tubes.

[0021] Figure 2 It is a structural schematic diagram of the thermal insulation heating box.

[0022] Figure 3 It is a schematic diagram of the structure of the blank frame.

[0023] Explanation of the reference numerals: 1—blank frame; 2—groove; 3—lifting column; 4—lifting ear; 5—round blank; 6—insulation and heating box; 7—boss; 8—burner; 9—upper cover; 10—hydraulic cylinder; 11—rotating hinge. DETAILED DESCRIPTION

[0024] like Figures 1 to 3 As shown, a device for hot delivery and hot loading of round billets for rolled steel pipes comprises: a heat preservation and heating box 6 arranged at the rear of a car, the heat preservation and heating box 6 of the car is composed of a box body arranged on the car and heat preservation bricks laid on the inner wall thereof, an upper cover 9 of the heat preservation and heating box 6 can be opened and closed, the upper cover 9 is a double-door form, and the opening and closing are controlled by two hydraulic cylinders 10 respectively, so as to facilitate the loading and unloading of the billet frame 1 into and out of the heat preservation and heating box 6, and the rear end of the hydraulic cylinder 10 is connected to a fixed bracket on the car through a rotating hinge 11;

[0025] The upper cover 9 of the heat preservation heating box 6 is provided with a lifting ring, and the upper cover 9 of the box body can also be opened and closed by a crane. When the upper cover is opened, a support frame is provided below it. One or more burners 8 are respectively provided on the four inner walls of the box body provided at the rear of the car. The burner 8 is connected to the energy source of the heating device through a pipeline. The energy source of the heating device of the car is hydrogen energy or methanol energy;

[0026] A through-length boss 7 is provided at the bottom of the heat preservation and heating box 6, which is matched with the groove 2 at the bottom of the blank frame 1, so as to stabilize the heat preservation and heating box 6 during transportation.

[0027] The shape of the blank frame 1 is an inverted trapezoid, which is convenient for loading and dumping the round blank 5. The two side walls of the blank frame 1 with the lifting ears 4 are provided with multiple through holes, which is convenient for heating the round blank 5. Two lifting columns 3 are symmetrically provided at the middle and upper positions of the other two side walls of the blank frame 1.

[0028] The hot delivery and hot loading methods are as follows:

[0029] During production, the hot round billets 5 just produced by continuous casting are hot cut into multiple hot billets of fixed length, and then transported to the side of the material rack via a conveyor roller and turned into the material rack by a turning mechanism. At this time, a crane equipped with a shovel fork shovels the hot round billets 5 in the material rack to the top of the billet frame 1 and pours them into the billet frame 1.

[0030] Another crane hangs the fixed sling to hang the hoisting column 3 of the billet frame 1 and hoists the billet frame 1 into the heat preservation and heating box 6 at the rear of the car. The crane hangs the fixed sling away, and the hydraulic cylinder 10 closes the upper cover 9 of the box. The heating device is started to continue heating the round billet 5 during the process of transporting the hot round billet 5 by the car.

[0031] After the car arrives at the steel pipe rolling site, the hydraulic cylinder 10 opens the upper cover 9 of the box body, and the large hook of the double-hook crane hangs the fixed sling to lift the billet frame 1 in the heat preservation and heating box 6 to the top of the hot round billet 5 loading platform in front of the annular heating furnace. The small hook of the crane hangs the wire rope and drops it to the lifting ear 4 and then lifts it up, dumping the round billet 5 in the billet frame 1 on the round billet 1 loading platform in front of the annular furnace. Then, the round billet 5 is loaded into the annular heating furnace, and then the rolling process is carried out.

[0032] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for hot delivery and hot loading of round tube billets for rolling steel tubes, characterized in that: It comprises a heat preservation and heating box arranged at the rear of the car, the inner wall of the heat preservation and heating box is paved with heat preservation bricks, the upper cover of the heat preservation and heating box can be opened and closed, and one or more burners are respectively arranged on the four inner walls of the box body arranged at the rear of the car, and each of the burners is connected to the energy source of the heating device through a pipeline; The bottom of the heat preservation and heating box is provided with a long boss, which is used to fit into the groove at the bottom of the blank frame, so as to stabilize the blank during transportation; The shape of the blank frame is an inverted trapezoid, which is convenient for loading and dumping round blanks. Lifting ears are provided on the two side walls of the blank frame, and multiple through holes are provided on the two side walls with the lifting ears to facilitate heating of the round blanks. Two lifting columns are symmetrically provided in the middle and upper positions of the other two side walls of the blank frame.

2. The device for hot delivery and hot loading of round tube billets for rolled steel tubes according to claim 1, characterized in that: The upper cover is in the form of a double door, and the opening and closing are controlled by two hydraulic cylinders respectively, so as to facilitate the loading and unloading of the blank frame into and out of the heat preservation and heating box. The rear end of the hydraulic cylinder is connected to the fixed bracket on the car through a rotating hinge.

3. The device for hot delivery and hot loading of round tube billets for rolled steel tubes according to claim 1, characterized in that: The upper cover is provided with a lifting ring, and the upper cover is opened and closed by a crane. When the upper cover is opened, a supporting frame is provided below the upper cover.

4. The device for hot delivery and hot loading of round tube billets for rolled steel tubes according to claim 1, characterized in that: The energy source of the heating device is hydrogen energy or methanol energy.

5. The device for hot delivery and hot loading of round tube billets for rolling steel tubes according to claim 3, characterized in that: A buffer elastic pad is arranged on the support frame.

6. The device for hot delivery and hot loading of round tube billets for rolling steel tubes according to claim 5, characterized in that: The buffer elastic pad is a rubber pad.

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