Semi-automatic pouring device for cast steel LF refining ladle and using method

Abstract

The cast steel LF refining ladle semi-automatic pouring device comprises an air cylinder, the top of a cylinder body of the air cylinder is hinged to an air cylinder connector, the air cylinder connector is fixed to the outer wall of a refining ladle, a triangular connector is hinged to the tail end of a piston rod of the air cylinder, and the vertex angle portion of the triangular connector is hinged to the refining ladle through a first pin shaft; a lower connector is hinged to the other vertex angle portion of the triangular connector through a second pin shaft, a lower sliding plate is connected to the lower connector, a lower water opening is formed in the lower sliding plate, the lower sliding plate is matched with an upper sliding plate, and an upper water opening used for being matched with the lower water opening is formed in the upper sliding plate. The device can instantly open and close the pouring gate of the steel ladle and prevent the molten steel leakage phenomenon, meanwhile, the pressing rod does not need to be manually pressed and lifted in the pouring process, an operator can operate by being more than 3 meters away from the steel ladle, and the safety of the operator is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of casting, and mainly relates to a semi-automatic pouring device for a ladle furnace (LF) refining ladle for cast steel and its usage method. Background Art

[0002] For castings with high requirements for molten steel cleanliness and performance, after the initial refining of the molten steel, it needs to be transferred to an LF refining ladle for refining operations, and then poured after refining. When pouring, the opening and closing of the pouring device of the LF refining ladle need to be manually controlled by operating a lever. The opening and closing of the ladle water outlet are achieved by manually pressing and lifting the lever.

[0003] The LF refining ladle is poured above the casting, and a Φ80 sliding nozzle is used. Due to the pressure generated by 10 - 13 tons of molten steel, at the moment of opening the nozzle, the flow rate of the molten steel can reach 100 - 120 Kg / s; the height of the sliding nozzle is 50 cm higher than that of the pouring cup, and there is a risk of molten steel splashing during the pouring process. During operation, it is about 1.5 m away from the pouring spout, and there is a great safety hazard that the molten steel may splash onto the operator. Moreover, the entire device is bulky, the speed of moving the nozzle is slow, and it often has difficulties in opening and closing. Summary of the Invention

[0004] To solve the above technical problems, the object of the present invention is to provide a semi-automatic pouring device for a ladle furnace (LF) refining ladle for cast steel and its usage method. This device can instantaneously open and close the ladle pouring spout, prevent molten steel leakage, and at the same time, there is no need for manual pressing and lifting of the lever during the pouring process. The operator can operate more than 3 meters away from the ladle, greatly improving the safety of the operator.

[0005] To achieve the above technical features, the object of the present invention is realized as follows: A semi-automatic pouring device for a ladle furnace (LF) refining ladle for cast steel includes a cylinder. The top of the cylinder body is hinged to a cylinder joint, and the cylinder joint is fixed on the outer wall of the refining ladle. The end of the piston rod of the cylinder is hinged to a triangular joint. The apex of the triangular joint is hinged to the refining ladle through a first pin shaft. Another apex of the triangular joint is hinged to a lower joint through a second pin shaft. A lower slide plate is connected to the lower joint, and a lower water outlet is arranged on the lower slide plate. The lower slide plate cooperates with an upper slide plate, and an upper water outlet for cooperating with the lower water outlet is arranged on the upper slide plate.

[0006] Preferably, a cylinder head is fixed to the top of the cylinder body by bolts and nuts, and the cylinder head is detachably hinged to the cylinder joint through a first positioning pin.

[0007] Preferably, a first air inlet and a second air inlet are arranged on the cylinder. The first air inlet and the second air inlet are connected to a gas source through a reversing valve. After the first air inlet intakes air, it will be used to push the piston rod downward, and after the second air inlet intakes air, it will be used to push the piston rod upward.

[0008] Preferably, the piston rod is detachably hinged to the triangular joint through a second positioning pin.

[0009] On the other hand, the present invention provides a method for using a semi-automatic pouring device for a cast steel LF refining ladle, including the following steps: Step 1, design and manufacture of the pouring device: Determine the basic dimensions of the triangular joint according to the stroke requirements of the sliding plate, and select a cylinder with a corresponding stroke; Step 2, assembly of the pouring device: Before pouring, assemble the pouring device with the corresponding refining ladle; Step 3, position adjustment of the sliding plate: Before pouring, adjust the sliding plate so that the lower nozzle is aligned with the sand mold sprue cup and then offset by at least 80 mm; Step 4, pouring operation: Drive the sliding plate through the cylinder, and then control the relative position between the lower nozzle and the upper nozzle to control the outflow of molten steel; Step 5, completion of pouring: After pouring is completed, drive the sliding plate through the cylinder, and then control the relative position between the lower nozzle and the upper nozzle to control the cut-off of molten steel.

[0010] Preferably, the specific process of step 2 is as follows: Fix the cylinder joint on the outer wall of the refining ladle. Fix the cylinder head and the cylinder with bolts and nuts. Connect the cylinder joint and the cylinder head with a first positioning pin. Connect the cylinder and the triangular joint with a second positioning pin. Connect the triangular joint to the refining ladle with a first pin shaft. Hang the cylinder head and the cylinder during pouring and remove them after pouring is completed.

[0011] Preferably, the specific process of step 4 is as follows: During pouring, connect the high-pressure air pipe to the first air inlet of the cylinder, open the air inlet valve, the air inlet pressure is 0.4 - 0.5 MPa, the cylinder intakes air, the piston rod moves downward, drives the triangular joint to rotate clockwise, causing the sliding plate to slide, and the lower nozzle is aligned with the upper nozzle, and the molten steel flows out.

[0012] Preferably, the specific process of step 5 is as follows: After pouring is completed, connect the high-pressure air pipe to the second air inlet of the cylinder, open the air inlet valve, the air inlet pressure is 0.4 - 0.5 MPa, the cylinder intakes air, the piston rod moves upward, drives the triangular joint to rotate counterclockwise, causing the sliding plate to slide back, and the lower nozzle is misaligned with the upper nozzle, and the molten steel is cut off.

[0013] The present invention has the following beneficial effects: 1. After using this brand-new molten steel refining ladle pouring device, it is possible to instantaneously open and close the ladle nozzle, without any molten steel leakage. At the same time, during the pouring process, there is no need for manual pressing or lifting of the pressure rod, and the operator can operate more than 3 meters away from the molten steel ladle, greatly improving the safety of the operator.

[0014] 2. The device of the present invention effectively improves the pouring environment of the sliding nozzle of the refining ladle, reduces safety risks, and improves the pouring quality, and is particularly suitable for pouring cast steel parts with high requirements for molten steel cleanliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the drawings and embodiments.

[0016] Figure 1 is the existing original refining ladle pouring device.

[0017] In the figure: A, pressure rod; B, connecting rod; C, upper slide plate; D, upper nozzle; E, lower slide plate; F, lower nozzle.

[0018] Figure 2 is the structural diagram of the pneumatic operating device of the present invention.

[0019] In the figure: 1, cylinder joint; 2, cylinder head; 3, cylinder; 4, first air inlet; 5, second air inlet; 6, upper slide plate; 7, upper nozzle; 8, lower slide plate; 9, lower nozzle; 10, lower joint; 11, triangular joint; 12, piston rod; 13, second positioning pin; 14, second pin shaft; 15, first pin shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The embodiments of the present invention will be further described below in conjunction with the drawings.

[0021] Figure 1 is the original refining ladle pouring device, which is a manual operating device. During pouring, it is necessary for an operator to manually press the pressure rod A, and the connecting rod B is lifted, causing the lower slide plate E to slide until the upper and lower nozzles are aligned, and the molten steel flows out. When the pressure rod A is lifted, the connecting rod B drops, and the upper and lower nozzles are misaligned, and the molten steel stops flowing. This pouring device requires manual pressing and lifting of the pressure rod. In this process, not only does the sliding nozzle move slowly, but also the operator operates at close range, and the splashing molten steel poses a great safety hazard.

[0022] Based on this, in order to solve the problem of inconvenient existing manual operation, a semi-automatic pouring device for the LF refining ladle of cast steel is provided in the present invention.

[0023] Example 1: See Figure 2, a semi-automatic pouring device for a steel-casting LF refining ladle, including a cylinder 3. The top of the cylinder block of the cylinder 3 is hinged to a cylinder joint 1, and the cylinder joint 1 is fixed on the outer wall of the refining ladle. The end of the piston rod 12 of the cylinder 3 is hinged to a triangular joint 11. The apex part of the triangular joint 11 is hinged to the refining ladle through a first pin 15. Another apex part of the triangular joint 11 is hinged to a lower joint 10 through a second pin 14. A lower slide plate 8 is connected to the lower joint 10. A pouring nozzle 9 is arranged on the lower slide plate 8. The lower slide plate 8 cooperates with an upper slide plate 6. A pouring inlet 7 for cooperating with the pouring nozzle 9 is arranged on the upper slide plate 6. By adopting the above-mentioned automatic pouring device, the cylinder 3 is remotely controlled, and then the piston rod 12 is driven by the cylinder 3. The triangular joint 11 is synchronously driven by the piston rod 12, and then the lower joint 10 and the lower slide plate 8 are driven by the triangular joint 11. Finally, the pouring nozzle 9 on the lower slide plate 8 cooperates with the pouring inlet 7 on the upper slide plate 6 to achieve the effect of controlling the pouring of molten steel. After using this brand-new pouring device for the molten steel refining ladle, it can instantaneously open and close the pouring gate of the molten steel ladle without molten steel leakage. At the same time, during the pouring process, there is no need for manual pressing and lifting of the pressure bar, and the operator can operate more than 3 meters away from the molten steel ladle, greatly improving the safety of the operator.

[0024] Furthermore, a cylinder head 2 is fixed to the top of the cylinder block of the cylinder 3 by bolts and nuts. The cylinder head 2 is hinged to the cylinder joint 1 in a detachable manner through a first positioning pin 16. Through the above-mentioned fixed installation structure between the cylinder head 2 and the cylinder 3, the reliability of its fixed installation is ensured. Through the connection method between the cylinder head 2 and the cylinder joint 1, it is convenient to disassemble the cylinder 3 subsequently.

[0025] Furthermore, a first air inlet 4 and a second air inlet 5 are arranged on the cylinder 3. The first air inlet 4 and the second air inlet 5 are connected to a gas source through a reversing valve. After the first air inlet 4 intakes air, it will be used to push the piston rod 12 downward. After the second air inlet 5 intakes air, it will be used to push the piston rod 12 upward. Through the above-mentioned cylinder 3, it can be used to provide the sliding power of the lower slide plate 8 during the subsequent pouring process, thereby controlling the automatic pouring of molten steel and realizing the remote control of the pouring process. During the working process, the first air inlet 4 of the cylinder 3 is connected through a high-pressure air pipe, the air inlet valve is opened, the air inlet pressure is 0.4 - 0.5 MPa, the cylinder 3 intakes air, the piston rod 12 moves downward, driving the triangular joint 11 to rotate clockwise, causing the lower slide plate 8 to slide, and the pouring nozzle 9 is aligned with the pouring inlet 7, and the molten steel flows out; after pouring is completed, the second air inlet 5 of the cylinder 3 is connected by the high-pressure air pipe connection, the air inlet valve is opened, the air inlet pressure is 0.4 - 0.5 MPa, the cylinder 3 intakes air, the piston rod 12 moves upward, driving the triangular joint 11 to rotate counterclockwise, causing the lower slide plate 8 to slide back, and the pouring nozzle 9 is misaligned with the pouring inlet 7, and the molten steel flow stops.

[0026] Among them, the reversing valve adopts a remotely controlled electromagnetic reversing valve, and during the specific pouring process, remote control can be utilized.

[0027] Furthermore, the piston rod 12 is detachably hinged to the triangular joint 11 through the second positioning pin 13. Through the above connection method, it is convenient to disassemble the cylinder 3 subsequently.

[0028] Embodiment 2: On the other hand, the present invention provides a method for using a semi-automatic pouring device for a steel-casting LF refining ladle, including the following steps: Step 1, design and manufacture of the pouring device: Determine the basic dimensions of the triangular joint 11 according to the stroke requirement of the lower slide plate 8, and select a cylinder 3 with a corresponding stroke; Step 2, assembly of the pouring device: Fix the cylinder joint 1 on the outer wall of the refining ladle. The cylinder head 2 and the cylinder 3 are fixed by bolts and nuts. The cylinder joint 1 and the cylinder head 2 are connected by the first positioning pin 16. The cylinder 3 and the triangular joint 11 are connected by the second positioning pin 13. The triangular joint 11 is connected to the refining ladle through the first pin shaft 15. During pouring, hang the cylinder head 2 and the cylinder 3, and remove them after pouring is completed.

[0029] Step 3, position adjustment of the lower slide plate 8: Before pouring, adjust the lower slide plate 8 so that the water outlet 9 is aligned with the sand mold sprue cup and then offset by at least 80 mm; Step 4, pouring operation: During pouring, the high-pressure air pipe is connected to the first air inlet 4 of the cylinder 3. Open the air inlet valve, and the air inlet pressure is 0.4 - 0.5 MPa. The cylinder 3 intakes air, the piston rod 12 moves downward, driving the triangular joint 11 to rotate clockwise, causing the lower slide plate 8 to slide, and the water outlet 9 is aligned with the water inlet 7, and the molten steel flows out.

[0030] Step 5, completion of pouring: After pouring is completed, the high-pressure air pipe is connected to the second air inlet 5 of the cylinder 3. Open the air inlet valve, and the air inlet pressure is 0.4 - 0.5 MPa. The cylinder 3 intakes air, the piston rod 12 moves upward, driving the triangular joint 11 to rotate counterclockwise, causing the lower slide plate 8 to slide back, and the water outlet 9 is misaligned with the water inlet 7, and the molten steel flow stops.

Claims

1. Semi-automatic pouring device for ladle furnace refining of cast steel, characterized in that, It includes a cylinder (3). The top of the cylinder block of the cylinder (3) is hinged to a cylinder joint (1), and the cylinder joint (1) is fixed on the outer wall of the refining ladle. The end of the piston rod (12) of the cylinder (3) is hinged to a triangular joint (11). The apex part of the triangular joint (11) is hinged to the refining ladle through a first pin shaft (15). Another apex part of the triangular joint (11) is hinged to a lower joint (10) through a second pin shaft (14). A lower slide plate (8) is connected to the lower joint (10). A tapping hole (9) is arranged on the lower slide plate (8). The lower slide plate (8) cooperates with an upper slide plate (6), and a pouring hole (7) for cooperating with the tapping hole (9) is arranged on the upper slide plate (6).

2. The semi-automatic pouring device for the steel-casting LF refining ladle according to claim 1, wherein: A cylinder head (2) is fixed to the top of the cylinder block of the cylinder (3) by bolts and nuts. The cylinder head (2) is detachably hinged to the cylinder joint (1) through a first positioning pin (16).

3. The semi-automatic pouring device for the ladle of the steel-casting LF refining furnace according to claim 1, wherein: A first air inlet (4) and a second air inlet (5) are arranged on the cylinder (3). The first air inlet (4) and the second air inlet (5) are connected to an air source through a reversing valve. After the first air inlet (4) intakes air, it will be used to push the piston rod (12) to move downward. After the second air inlet (5) intakes air, it will be used to push the piston rod (12) to move upward.

4. The semi-automatic pouring device for the ladle of the cast steel LF refining furnace according to claim 1, characterized in that: The piston rod (12) is detachably hinged to the triangular joint (11) through a second positioning pin (13).

5. The using method of the semi-automatic pouring device for the steel-casting LF refining ladle according to any one of claims 1-4, characterized in that, It includes the following steps: Step 1, design and manufacture of the pouring device: Determine the basic dimensions of the triangular joint (11) according to the stroke requirement of the lower slide plate (8), and select a cylinder (3) with a corresponding stroke; Step 2, assembly of the pouring device: Before pouring, assemble the pouring device with the corresponding refining ladle; Step 3, position adjustment of the lower slide plate (8): Before pouring, adjust the lower slide plate (8) so that the tapping hole (9) is aligned with the sprue cup of the sand mold and then offset by at least 80 mm; Step 4, pouring operation: Drive the lower slide plate (8) through the cylinder (3), and then control the relative position between the tapping hole (9) and the pouring hole (7) to control the flow of molten steel; Step 5, completion of pouring: After the pouring is completed, drive the lower slide plate (8) through the cylinder (3), and then control the relative position between the tapping hole (9) and the pouring hole (7) to control the cut-off of molten steel.

6. The usage method of the semi-automatic pouring device for the steel-casting LF refining ladle according to claim 5, characterized in that, The specific process of Step 2 is as follows: Fix the cylinder joint (1) on the outer wall of the refining ladle. Fix the cylinder head (2) and the cylinder (3) with bolts and nuts. Connect the cylinder joint (1) and the cylinder head (2) through the first positioning pin (16). Connect the cylinder (3) and the triangular joint (11) through the second positioning pin (13). Connect the triangular joint (11) to the refining ladle through the first pin shaft (15). Hang the cylinder head (2) and the cylinder (3) during pouring and remove them after pouring is completed.

7. The method for using the semi-automatic pouring device of the steel-casting LF refining ladle according to claim 5, characterized in that The specific process of Step 4 is as follows: During pouring, the high-pressure air pipe is connected to the first air inlet (4) of the cylinder (3). The air inlet valve is opened, and the inlet air pressure is 0.4 - 0.5 MPa. The cylinder (3) intakes air, and the piston rod (12) moves downward, driving the swivel joint (11) to rotate clockwise, causing the lower slide plate (8) to slide, aligning the lower water outlet (9) with the upper water outlet (7), and the molten steel flows out.

8. The usage method of the semi-automatic pouring device for the cast steel LF refining ladle according to claim 5, characterized in that, The specific process of step 5 is as follows: After pouring is completed, the high-pressure air pipe is connected to the second air inlet (5) of the cylinder (3). The air inlet valve is opened, and the inlet air pressure is 0.4 - 0.5 MPa. The cylinder (3) intakes air, and the piston rod (12) moves upward, driving the swivel joint (11) to rotate counterclockwise, causing the lower slide plate (8) to slide back, misaligning the lower water outlet (9) with the upper water outlet (7), and the molten steel flow cuts off.

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