Electric furnace tilting hydraulic cylinder

Abstract

The utility model discloses an electric furnace tilting hydraulic cylinder which comprises a cylinder body, two pistons and two piston rods, two parallel cylindrical cavities are formed in the cylinder body, the upper ends of the two cylindrical cavities are blocked by an upper end cover, the lower ends of the two cylindrical cavities are blocked by a lower end cover, and a lower lug plate is arranged on the lower portion of the lower end cover; the two pistons are installed in the two cylindrical cavities in a sliding mode respectively, upper lug plates are installed at the upper ends of the two piston rods, the lower ends of the two piston rods penetrate through through holes in the upper end cover in a sliding mode and then are connected with the two pistons respectively, and two upper oil ports are formed in the upper end cover and communicated with the two cylindrical cavities respectively. And two lower oil ports are formed in the lower end cover and are respectively communicated with the two cylindrical cavities. The two parallel piston rods and the two pistons are installed in the same cylinder body to form two hydraulic cylinders capable of working independently, one hydraulic cylinder is standby, the other hydraulic cylinder is used, when the hydraulic cylinder in use breaks down, the standby hydraulic cylinder is switched to enable an electric furnace to tap steel smoothly, and therefore normal smelting production of the electric furnace can be guaranteed.

Description

Technical Field

[0001] The utility model relates to an electric furnace tilting hydraulic cylinder used in the process of steel smelting, belonging to the technical field of metallurgical equipment. Background Art

[0002] During the production process of electric furnace smelting, when tapping steel and slag, an electric furnace tilting hydraulic cylinder is required to drive the swing platform and the electric furnace to tilt. With the popularization of the eccentric bottom tapping (EBT) electric furnace smelting process, the performance of the electric furnace tilting hydraulic cylinder becomes increasingly important.

[0003] During the working process of the electric furnace tilting hydraulic cylinder, faults such as internal leakage and external leakage of the hydraulic cylinder often occur. After the tilting hydraulic cylinder fails, the electric furnace cannot tap steel. The existing solution is to replace the electric furnace tilting hydraulic cylinder. However, replacing the electric furnace hydraulic cylinder requires coordinating the staff of multiple departments such as production, maintenance, and safety, and it takes 12 - 16 hours for replacement. This disrupts the production rhythm and seriously affects the normal progress of smelting production. Therefore, the existing electric furnace tilting hydraulic cylinder cannot ensure smooth tapping of steel, and it can no longer meet the requirements of the eccentric bottom tapping electric furnace smelting process, becoming a bottleneck in electric furnace smelting, and it is necessary to improve it. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an electric furnace tilting hydraulic cylinder aiming at the disadvantages of the existing technology, so as to ensure smooth tapping of steel during the production process of electric furnace smelting and ensure the normal progress of production.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An electric furnace tilting hydraulic cylinder includes a cylinder body, two pistons, and two piston rods. Two mutually parallel cylindrical cavities are arranged in the cylinder body. The upper ends of the two cylindrical cavities are sealed by an upper end cover, and the lower ends are sealed by a lower end cover. A lower ear plate is arranged at the lower part of the lower end cover; the two pistons are respectively slidably installed in the two cylindrical cavities. Upper ear plates are installed at the upper ends of the two piston rods. The lower ends respectively pass through the through holes on the upper end cover and are connected to the two pistons. Two upper oil ports are arranged on the upper end cover, and the two upper oil ports are respectively communicated with the upper ends of the two cylindrical cavities; two lower oil ports are arranged on the lower end cover, and the two lower oil ports are respectively communicated with the lower ends of the two cylindrical cavities.

[0007] For the above electric furnace tilting hydraulic cylinder, a guide sleeve is slidably sleeved on each piston rod. The guide sleeve is fixed in the through hole of the upper end cover, and a static seal is installed on the guide sleeve.

[0008] For the above electric furnace tilting hydraulic cylinder, a dust-proof flange is slidably sleeved on each piston rod. The dust-proof flange is fixedly connected to the top of the upper end cover, and a dust-proof ring is installed in the central hole of the dust-proof flange.

[0009] For the above-mentioned electric furnace tilting hydraulic cylinder, the lower end of the piston rod passes through the central hole of the piston and is fixedly connected to the piston through a lock nut guide sleeve.

[0010] For the above-mentioned electric furnace tilting hydraulic cylinder, a Y-shaped sealing ring is installed between the piston and the side wall of the cylindrical cavity.

[0011] For the above-mentioned electric furnace tilting hydraulic cylinder, the upper end of the cylinder body is connected to the upper end cover through an integral upper flange, and the lower end is connected to the lower end cover through an integral lower flange.

[0012] For the above-mentioned electric furnace tilting hydraulic cylinder, two lower ear plates are provided at the lower part of the lower end cover, and the two lower ear plates are respectively opposite to the two piston rods.

[0013] In the utility model, two mutually parallel piston rods and two pistons are installed in the same cylinder body to form two independently working hydraulic cylinders. The two hydraulic cylinders are used in a standby mode. When the in-use hydraulic cylinder fails, switching to the standby hydraulic cylinder can enable the electric furnace to tap steel smoothly, thereby ensuring the normal progress of the electric furnace smelting production. Description of the Drawings

[0014] The following further elaborates on the present utility model in conjunction with the drawings and specific embodiments.

[0015] Figure 1 is the external view of the present utility model;

[0016] Figure 2 is the front view of the present utility model;

[0017] Figure 3 is Figure 2 the A-A cross-sectional view of

[0018] Figure 4 is Figure 3 the M-direction view of

[0019] Figure 5 is Figure 3 the N-direction view of

[0020] Figure 6 is Figure 3 the B-B cross-sectional view of

[0021] Figure 7 is the usage schematic diagram of the present utility model;

[0022] Figure 8 is Figure 7 the K-direction view of

[0023] The labels in the figure are as follows: 1. Dust-proof flange, 2. Guide sleeve, 3. Upper end cover, 4. Upper oil port, 5. Integral upper flange, 6. Cylinder block, 7. Integral lower flange, 8. Lower oil port, 9. Lower end cover, 10. Lower ear plate, 11. Lock nut guide sleeve, 12. Piston, 13. Piston rod, 14. Upper ear plate, 15. Tilting hydraulic cylinder, 16. Lower base, 17. Upper base, 18. Swing platform, 19. Electric furnace, 20. Upper pin shaft, 21. Lower pin shaft, 22. Cylindrical cavity. Specific implementation mode

[0024] Aiming at the disadvantages of the prior art, the utility model provides a tilting hydraulic cylinder for an electric furnace. The tilting hydraulic cylinder adopts a two-cylinder composite redundant design. During the smelting production process of the electric furnace, one cylinder is used and the other cylinder is used as a standby. When the cylinder in use fails, it can be switched to the standby cylinder to enable the electric furnace to discharge steel smoothly and ensure the normal progress of production.

[0025] Taking a 150-ton electric furnace as an example, the utility model will be further described below in conjunction with the attached drawings.

[0026] Refer to Figures 1-7 , the utility model includes a cylinder block 6, an upper end cover 3, a lower end cover 9, two pistons 12 and two piston rods 13. Two mutually parallel cylindrical cavities 22 are arranged in the cylinder block 6. The upper ends of the two cylindrical cavities 22 are blocked by the upper end cover 3, and the lower ends are blocked by the lower end cover 9. A lower ear plate 10 is fixed to the lower part of the lower end cover 9. The two pistons 12 are respectively installed in the two cylindrical cavities 22 and are in sliding contact with the side walls of the cylindrical cavities 22. Upper ear plates 14 are installed at the upper ends of the two piston rods 13. The lower ends slide through the through holes in the upper end cover 3 and are respectively inserted into the two cylindrical cavities 22 and are respectively connected to the two pistons 12. Two upper oil ports 4 are arranged on the upper end cover 3, and the two upper oil ports 4 are respectively communicated with the upper ends of the two cylindrical cavities 22; two lower oil ports 8 are arranged on the lower end cover 9, and the two lower oil ports 8 are respectively communicated with the lower ends of the two cylindrical cavities 22.

[0027] A dust-proof flange 1 is slidably sleeved on each piston rod 13. The dust-proof flange 1 is connected to the top of the upper end cover 3 by bolts. A dust-proof ring is installed in the central hole of the dust-proof flange 1 to prevent external dust from entering the cylindrical cavity 22; a guide sleeve 2 is slidably sleeved on each piston rod 13. The guide sleeve 2 is fixedly installed in the inner hole of the upper end cover 3, and a static seal is installed on it to seal the piston rod 13.

[0028] The upper end of the cylinder block 6 is provided with an integral upper flange 5, and the lower end is provided with an integral lower flange 7. The cylinder block 6 is welded together with the integral upper flange 5 and the integral lower flange 7. The integral upper flange 5 is connected to the upper end cover 3 through bolts, and the integral lower flange 7 is connected to the lower end cover 9 through bolts. Two lower ear plates 10 are welded on the lower end cover 9, and the two lower ear plates 10 are respectively opposite to the two piston rods 13. Pin holes are provided on both the lower ear plates 10 and the upper ear plates 14 for connecting with the upper base 17 on the swing platform 18 and the lower base 16 on the concrete foundation.

[0029] As shown in the figure, the lower end of the piston rod 13 passes through the central hole of the piston 12 and is fixedly connected to the piston 12 through a lock nut guide sleeve 29. Two sets of Y-shaped sealing rings are installed on the piston 12.

[0030] See Figure 7 and Figure 8 The two lower ear plates 10 of the tilting hydraulic cylinder 15 are hinged to the lower base 16 through a lower pin shaft 21. The upper ear plate 14 at the upper end of one piston rod 13 of the tilting hydraulic cylinder 15 is connected to the upper base 17 through an upper pin shaft 20. The upper ear plate 14 at the upper end of the other piston rod 13 is not connected to the upper base 17. The lower base 16 is connected to the concrete foundation, and the upper base 17 is connected to the swing platform 18. The electric furnace 19 is installed on the swing platform 18. The hydraulic pipeline is connected to the two cylindrical cavities 22 through the upper oil port 4 and the lower oil port 8.

[0031] The usage method of the present utility model is as follows:

[0032] Only the upper ear plate 14 at the upper end of one piston rod 13 of the tilting hydraulic cylinder 15 is connected to the upper base 17. Open the valves connected to the upper oil port 4 and the lower oil port 8 of the cylindrical cavity 22 corresponding to this piston rod 13 in the hydraulic pipeline, and close the valves connected to the other upper oil port 4 and the other lower oil port 8.

[0033] Tilting of the electric furnace:

[0034] The pressure oil enters from the opened lower oil port 8, and the opened upper oil port 4 returns the oil. The pressure oil correspondingly pushes the piston 12 to move upward, the piston rod 13 extends, and pushes the upper ear plate 14 and the upper base 17 to move upward, realizing the tilting of the swing platform 18 and the electric furnace 19. When the tilting is in place, the hydraulic system stops supplying oil to the upper oil port 4 and the lower oil port 8 and locks itself.

[0035] Reset of the electric furnace:

[0036] The pressure oil enters from the opened upper oil port 31, and the opened lower oil port 8 returns the oil. The pressure oil pushes the piston 12 to move downward, the piston rod 13 retracts, drives the upper ear plate 14 and the upper base 17 to move downward, realizing the return of the swing platform 18 and the electric furnace 19. When the electric furnace 19 returns to the place, the hydraulic system stops supplying oil to the cylinder upper oil port 4 and the lower oil port 8 and locks itself.

[0037] When the piston rod 13 and related components connected to the upper base 17 fail, resulting in the abnormal operation of the tilting hydraulic cylinder 15, close the valves of the original open upper oil port 4 and lower oil port 8. At the same time, remove the upper pin shaft 20 in the original upper ear plate 14 connected to the upper base 17, connect another upper ear plate 14 to the upper base 17 with the upper pin shaft 20, and then open the valves of the original closed upper oil port 4 and lower oil port 8, and the tilting hydraulic cylinder 15 can continue to be used.

Claims

1. An electric furnace tilting hydraulic cylinder, characterized in that, It includes a cylinder block (6), two pistons (12) and two piston rods (13). Two parallel cylindrical cavities (22) are provided in the cylinder block (6). The upper ends of the two cylindrical cavities (22) are blocked by an upper end cover (3), and the lower ends are blocked by a lower end cover (9). A lower ear plate (10) is provided at the lower part of the lower end cover (9). The two pistons (12) are respectively slidably installed in the two cylindrical cavities (22). Upper ear plates (14) are installed at the upper ends of the two piston rods (13). The lower ends slide through the through holes in the upper end cover (3) and are respectively connected to the two pistons (12). Two upper oil ports (4) are provided on the upper end cover (3), and the two upper oil ports (4) are respectively communicated with the upper ends of the two cylindrical cavities (22). Two lower oil ports (8) are provided on the lower end cover (9), and the two lower oil ports (8) are respectively communicated with the lower ends of the two cylindrical cavities (22).

2. The tilting hydraulic cylinder of an electric furnace according to claim 1, characterized in that, A guide sleeve (2) is slidably sleeved on each piston rod (13). The guide sleeve (2) is fixed in the through hole of the upper end cover (3), and a static seal is installed on the guide sleeve (2).

3. An electric furnace tilting hydraulic cylinder according to claim 1 or 2, characterized in that, A dust-proof flange (1) is slidably sleeved on each piston rod (13). The dust-proof flange (1) is fixedly connected to the top of the upper end cover (3), and a dust-proof ring is installed in the central hole of the dust-proof flange (1).

4. The tilting hydraulic cylinder of an electric furnace according to claim 3, characterized in that, The lower end of the piston rod (13) passes through the central hole of the piston (12) and is fixedly connected to the piston (12) through a lock nut guide sleeve (29).

5. A tilting hydraulic cylinder for an electric furnace according to claim 4, characterized in that, A Y-shaped sealing ring is installed between the piston (12) and the side wall of the cylindrical cavity (22).

6. A tilting hydraulic cylinder for an electric furnace according to claim 5, characterized in that, The upper end of the cylinder block (6) is connected to the upper end cover (3) through an integral upper flange (5), and the lower end is connected to the lower end cover (9) through an integral lower flange (7).

7. An electric furnace tilting hydraulic cylinder according to claim 6, characterized in that, Two lower ear plates (10) are provided at the lower part of the lower end cover (9), and the two lower ear plates (10) are respectively opposite to the two piston rods (13).

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