Tilting and ejecting hydraulic cylinder for continuous casting tundish

Abstract

The continuous casting tundish tipping ejection hydraulic cylinder is arranged on a tipping frame and comprises a plurality of hydraulic cylinder bodies, the hydraulic cylinder bodies are in one-to-one correspondence with water gaps of a tundish, the hydraulic cylinder bodies are located under the corresponding water gaps of the tundish, each hydraulic cylinder body comprises a cylinder barrel and a piston rod in sliding connection with the cylinder barrel, and the piston rods are connected with the cylinder barrels in a sliding mode. The end, used for penetrating out of the piston cylinder, of the cylinder barrel is a cylinder barrel head, a sleeve is fixedly arranged on the cylinder barrel head, the axial end of the sleeve is fixedly connected with the cylinder barrel head, the other end of the sleeve is fixedly connected with the tipping frame, and the stroke of the hydraulic cylinder body is smaller than or equal to 200 mm. According to the hydraulic cylinder, the contact length of the piston rod and the water gap of the tundish can be reduced, when the tundish is slightly placed incorrectly, the situation that the piston rod is scratched too long due to the fact that the stroke of the hydraulic cylinder is too long can be avoided, the length of the piston rod scratched by the edge of the water gap can be effectively reduced, sealing of the head of the oil cylinder is protected, and the oil leakage phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of steel production, in particular to a hydraulic cylinder for tilting and ejecting a continuous casting tundish. Background Art

[0002] The tundish of the continuous casting machine is a refractory container between the continuous casting ladle and the crystallizer. It is used to receive the molten steel flowing down from the ladle and divert it to each crystallizer through multiple water inlets arranged on it. After the tundish has been used for a period of time, the residual steel is easy to adhere to the wall of the tundish, affecting the use of the tundish and requiring maintenance. During maintenance, the tundish needs to be clamped on the tilting frame, and then the tundish needs to be turned 180° by the tilting frame to dump out most of the residual steel in the tundish, and then the ejection hydraulic cylinder is inserted from the water inlet of the tundish to eject the residual steel that has been cooled and adhered in the tundish.

[0003] Although the ejector hydraulic cylinder can eject the stuck residual steel, there are also certain problems: once the overall tundish is slightly deformed or the tundish is not placed properly on the tipping frame, when the tundish is turned over, the piston rod of the ejector hydraulic cylinder will hit the water outlet and the piston rod will be easily scratched when it hits the edge of the water outlet. After the scratched piston rod is retracted, it is easy to damage the seal of the cylinder head (the end of the piston rod that passes through the cylinder barrel of the hydraulic cylinder) and cause oil leakage. In addition, if the piston rod of the ejector hydraulic cylinder is not retracted in time after pushing the water outlet, the piston rod will stay at the water outlet of the tundish for a long time, causing its temperature to be too high. When the piston rod is retracted, it will also burn the cylinder head seal and cause oil leakage. The maintenance frequency and maintenance cost are high. Utility Model Content

[0004] The main purpose of the utility model is to provide a continuous casting tundish tilting and ejecting hydraulic cylinder to solve the problem that the cylinder head seal of the tilting and ejecting hydraulic cylinder is easily damaged during the maintenance of the tundish of the existing continuous casting machine, resulting in high maintenance frequency and cost.

[0005] To solve the above problems, the utility model is achieved as follows:

[0006] A hydraulic cylinder for tilting and ejecting a continuous casting tundish is arranged on a tilting frame and comprises a plurality of hydraulic cylinder bodies, wherein the hydraulic cylinder bodies correspond one to one with water outlets of the tundish and the hydraulic cylinder bodies are located directly below the corresponding water outlets of the tundish, the hydraulic cylinder bodies comprise a cylinder barrel and a piston rod slidably connected to the cylinder barrel, the end of the cylinder barrel for passing through the piston cylinder is a cylinder barrel head, a sleeve is fixedly arranged on the cylinder barrel head, one axial end of the sleeve is fixedly connected to the cylinder barrel head, and the other end of the sleeve is fixedly connected to the tilting frame, and the stroke of the hydraulic cylinder body is less than or equal to 200 mm.

[0007] Wherein, the stroke of the hydraulic cylinder body is 160mm.

[0008] Wherein, the sleeve is coaxially arranged with the cylinder, and the sleeve is fixedly connected with the cylinder via a flange.

[0009] Among them, an upper flange is fixedly mounted on the outer peripheral side of one end of the sleeve connected to the cylinder, and the upper flange is coaxially arranged with the sleeve; a lower flange is coaxially and fixedly mounted on the outer peripheral side of the cylinder head; the upper flange and the lower flange are fixedly connected by bolts.

[0010] Wherein, a mounting seat is sleeved on a side of the sleeve away from the cylinder.

[0011] Wherein, the outer diameter of the sleeve is equal to the outer diameter of the cylinder.

[0012] Wherein, an arc-shaped protrusion is fixedly arranged on the top end of the piston rod.

[0013] The beneficial effects of the utility model are:

[0014] When the utility model enters the water inlet to lift up the sticking steel of the tundish, the contact length between the piston rod and the water inlet of the tundish can be reduced. When the tundish is slightly misplaced, it can prevent the hydraulic cylinder from being too long and causing the piston rod to be scratched too long, and can effectively reduce the length of the piston rod scratched by the edge of the water inlet. Due to the setting of the sleeve, the scratched part of the piston rod only needs to stay in the sleeve when it is retracted, and will not be in contact with the cylinder head seal, thereby protecting the seal of the cylinder head and avoiding oil leakage. In addition, even if the piston cylinder top water inlet is not retracted in time, the high temperature section of the piston rod only needs to stay in the sleeve when it is retracted, and the cylinder head seal will not be burned, thereby solving the problem of easy oil leakage of the hydraulic cylinder head seal.

[0015] The utility model has the advantages of simple structure, small capital investment, easy operation, easy maintenance, easy popularization and implementation, and can solve the problem of short service life of the hydraulic cylinder, thereby reducing the maintenance cost of the hydraulic cylinder and the oil consumption cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Figure 1 It is a structural schematic diagram of the utility model in use state;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 It is a structural diagram of the mounting base.

[0020] Description of Reference Numerals

[0021] 1. Tilt frame; 2. Hydraulic cylinder body; 21. Cylinder barrel; 22. Piston rod; 3. Sleeve; 4. Raised portion; 5. Upper flange; 6. Lower flange; 7. Tundish; 71. Water inlet; 8. Mounting seat; 9. Filter section. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0023] like Figure 1 , Figure 2 As shown, a hydraulic cylinder for tilting and ejecting a continuous casting tundish 7 of the utility model is arranged on a tilting frame 1, and includes a plurality of hydraulic cylinder bodies 2. The hydraulic cylinder bodies 2 correspond to the water inlets 71 of the tundish 7 one by one, and the hydraulic cylinder bodies 2 are located directly below the corresponding water inlets 71 of the tundish 7. The hydraulic cylinder bodies 2 include a cylinder barrel 21 and a piston rod 22 slidably connected to the cylinder barrel 21. The connection between the piston rod 22 and the cylinder barrel is a common structure of a hydraulic cylinder and belongs to the prior art in this field, but does not belong to the innovation of the utility model. One end of the cylinder barrel 21 for passing through the piston cylinder is a cylinder barrel head, and a sleeve 3 is fixedly arranged on the cylinder barrel head. One axial end of the sleeve 3 is fixedly connected to the cylinder barrel head, and the other end of the sleeve 3 is fixedly connected to the tilting frame 1. In this embodiment, the tilting frame 1 includes a mounting plate located at its upper portion, and the sleeve 3 is fixedly arranged on the lower surface of the mounting plate of the tilting frame 1, and the sleeve 3 is coaxially arranged with the cylinder barrel 21. The outer diameter of the sleeve 3 is equal to the outer diameter of the cylinder 21, which can ensure the overall appearance of the device and also facilitate the flange connection between the sleeve 3 and the cylinder 21. The sleeve 3 is fixedly connected to the cylinder 21 through a flange. In this embodiment, an upper flange 5 is fixedly sleeved on the outer peripheral side of the end of the sleeve 3 that is connected to the cylinder 21, and the upper flange 5 is coaxially arranged with the sleeve 3. A lower flange 6 is coaxially and fixedly sleeved on the outer peripheral side of the cylinder head, and the lower flange 6 is coaxially and fixedly arranged with the cylinder. The upper flange 5 and the lower flange 6 are fixedly connected by bolts. A mounting seat 8 is sleeved on the side of the sleeve 3 away from the cylinder 21, and the mounting seat 8 is fixedly connected to the sleeve 3 and is slidably connected to the piston rod. In this embodiment, the mounting seat 8 is fixedly set on the lower surface of the mounting plate of the tilting frame 1 by bolts. As Figure 3 As shown, the mounting seat 8 adopts a square plate structure, and the outer edges of the mounting seat 8 are all convex to the corresponding sides of the upper flange 5 and the lower flange 6, so as to ensure the stability of the hydraulic cylinder body during operation.

[0024] The stroke of the hydraulic cylinder body 2 is less than or equal to 200mm. Among them, the stroke of the hydraulic cylinder body 2 is 160mm. In the utility model, when the piston rod 22 of the hydraulic cylinder body 2 is in a fully retracted state, the distance between the top of the piston rod 22 and the bottom of the water outlet 71 is less than or equal to 200mm. In this embodiment, when the piston rod 22 of the hydraulic cylinder body 2 is in a fully retracted state, the distance between the top of the piston rod 22 and the bottom of the water outlet 71 is equal to or slightly less than 160mm. After the top of the piston rod 22 contacts the bottom of the water outlet 71, the moving distance after reaching the top of the water inlet 71 and lifting the sticky steel is 80mm, which can meet the requirements for the separation of the sticky steel from the tundish. In this embodiment, the rod diameter of the piston rod 22 is 70mm.

[0025] like Figure 1 and Figure 2 As shown, an arc-shaped protrusion 4 is fixedly provided at the top of the piston rod 22, and the upper part of the protrusion 4 is an arc-shaped protrusion protruding toward the water inlet 71, and the lower part of the protrusion 4 is a cylindrical structure. The upper and lower parts of the protrusion 4 are integrally formed, and a stepped filter section 9 is fixedly connected between the protrusion 4 and the corresponding end of the piston rod 22. The filter section 9 includes an upper filter section and a lower filter section. The upper filter section and the lower filter section are arranged in sequence from top to bottom. The top of the upper filter section is fixedly connected to the bottom end of the protrusion 4, the bottom end of the upper filter section is fixedly connected to the top of the lower filter section, and the bottom end of the lower filter section is fixedly connected to the corresponding end of the piston rod 22. The upper filter section, the lower filter section, the protrusion 4, and the piston rod 22 of the filter section 9 are coaxial, so that the protrusion 4 can provide sufficient strength support for it when lifting the bonded steel of the tundish. The outer diameter of the upper filter section of the filter section 9 is smaller than the outer diameter of the protrusion 4, and the outer diameter of the lower filter section of the filter section 9 is larger than the outer diameter of the upper filter section and smaller than the outer diameter of the piston rod 22. The setting of the protrusion 4 can further reduce the wear of the piston rod.

[0026] like Figure 1 , Figure 2As shown, when it is necessary to clean the stuck steel in the tundish 7, the tilting frame 1 is used to drive the tundish 7 to flip 180°, and then the piston rod 22 is pushed out. Under the action of the sleeve 3, the piston rod 22 has an idle stroke before it hits the water inlet 71, and continues to push into the water inlet 71 after contacting the water inlet 71 in the second half of the time. Since the stroke of the hydraulic cylinder body 2 of the utility model is less than or equal to 200 mm, the distance that the piston rod 22 continues to push into the water inlet 71 after contacting the water inlet 71 fully meets the requirement for the separation of the stuck steel from the tundish, which can reduce the contact length of the piston rod with the water inlet 71 of the tundish. When the tundish 7 is slightly misplaced, it can avoid that the hydraulic cylinder stroke is too long, resulting in the piston rod being scratched too long, and the length of the piston rod 22 being scratched by the edge of the water inlet 71 can be effectively reduced. Due to the setting of the sleeve 3, the scratched part of the piston rod 22 only needs to stay in the sleeve 3 when it is retracted, and will not be in sealing contact with the head of the cylinder barrel 21, thereby protecting the seal of the cylinder head (i.e., the cylinder head seal) and avoiding oil leakage. In addition, even if the piston cylinder 22 is not retracted in time after pushing the water outlet 71, the high-temperature section of the piston rod 22 can stay in the sleeve 3 when it is retracted, and the head seal of the cylinder 21 will not be burned.

[0027] The utility model has also achieved remarkable results in actual use. Before the use of the device of the utility model, the original continuous casting tundish tilting device had a total of 8 ejection hydraulic cylinders (model; 100 / 70-500). Due to slight deformation of the tundish as a whole or improper placement of the tundish on the tilting frame, when the tundish is turned, the cylinder rod (piston rod) hits the edge of the water outlet and scratches the cylinder rod when the cylinder rod hits the water outlet. The cylinder stroke is too long and the scratched cylinder rod is also long. After the cylinder rod is retracted, the cylinder head seal is damaged, causing oil leakage. In addition, the cylinder rod is not retracted in time after hitting the water outlet. The cylinder rod stays at the tundish water outlet for a long time, causing the cylinder rod temperature to be too high. When the cylinder rod is retracted, the seal will be burned and cause oil leakage. 19 ejection hydraulic cylinders need to be replaced in half a year, and the tundish tilting hydraulic station consumes 2 barrels of hydraulic oil, resulting in large consumption of cylinders and hydraulic oil, and each cylinder repair requires the replacement of the cylinder rod, which increases the maintenance cost. The utility model can avoid the oil cylinder rod from being scratched and the high temperature part from contacting the cylinder head seal to cause oil leakage of the oil cylinder, thereby reducing the maintenance frequency and extending the service life of the oil cylinder.

[0028] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A hydraulic cylinder for tilting and ejecting a continuous casting tundish, arranged on a tilting frame, characterized in that: It comprises a plurality of hydraulic cylinder bodies, which correspond one to one with the water inlets of the tundish, and are located directly below the corresponding water inlets of the tundish, and the hydraulic cylinder bodies comprise a cylinder barrel, and a piston rod slidably connected to the cylinder barrel, and one end of the cylinder barrel for passing through the piston rod is a cylinder barrel head, a sleeve is fixedly arranged on the cylinder barrel head, one axial end of the sleeve is fixedly connected to the cylinder barrel head, and the other end of the sleeve is fixedly connected to the tilting frame, and the stroke of the hydraulic cylinder body is less than or equal to 200 mm.

2. The hydraulic cylinder for tilting and ejecting a continuous casting tundish according to claim 1, characterized in that: The stroke of the hydraulic cylinder body is 160 mm.

3. The hydraulic cylinder for tilting and ejecting a continuous casting tundish according to claim 1, characterized in that: The sleeve is coaxially arranged with the cylinder, and the sleeve is fixedly connected with the cylinder via a flange.

4. The hydraulic cylinder for tilting and ejecting a continuous casting tundish according to claim 3, characterized in that: An upper flange is fixedly sleeved on the outer peripheral side of one end of the sleeve connected to the cylinder, and the upper flange is coaxially arranged with the sleeve; a lower flange is coaxially and fixedly sleeved on the outer peripheral side of the cylinder head; the upper flange and the lower flange are fixedly connected by bolts.

5. The hydraulic cylinder for tilting and ejecting a continuous casting tundish according to claim 1, characterized in that: A mounting seat is sleeved on one side of the sleeve away from the cylinder.

6. The hydraulic cylinder for tilting and ejecting a continuous casting tundish according to claim 1, characterized in that: The outer diameter of the sleeve is equal to the outer diameter of the cylinder.

7. The hydraulic cylinder for tilting and ejecting a continuous casting tundish according to claim 1, characterized in that: An arc-shaped protrusion is fixedly arranged on the top end of the piston rod.

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