Roll bending cylinder of reversible rolling mill

Abstract

The utility model relates to a roller bending cylinder of a reversible rolling mill and belongs to the technical field of hydraulic equipment in the metallurgical industry. According to the technical scheme, the sealing device comprises a piston rod (1), a guide sleeve (2), sealing pieces (3) and a roll bending cylinder body (4), the piston rod (1) is provided with the two sealing pieces (3) and the guide sleeve (2), the guide sleeve (2) is located between the two sealing pieces (3), and the two sealing pieces (3) and the guide sleeve (2) form a piston matched with an inner hole of a cavity of the roll bending cylinder body (4); the piston rod (1) is in a stepped cylinder shape with one thick end and one thin end, and the two sealing pieces (3) and the guide sleeve (2) are installed at the thick end of the piston rod (1) respectively. The roll bending cylinder has the advantages that inner leakage of the inner hole of the roll bending cylinder cavity is avoided, it is guaranteed that roll bending force can meet the requirement for normal use of a rolling mill, and the service life of the roll bending cylinder is prolonged.

Description

Technical Field

[0001] The utility model relates to a reversible rolling mill roll bending cylinder, belonging to the technical field of hydraulic equipment in the metallurgical industry. Background Art

[0002] The bending roll cylinder in the reversible rolling mill is a special hydraulic cylinder. It is installed on the inner side of the rolling mill arch. It works in harsh conditions and has a working temperature of 60-70℃. There are four cavities on the cylinder body, which are equipped with four piston rods. Two guide sleeves and a sealing ring are installed on the piston rods. The two guide sleeves are located on both sides of the sealing ring. The two guide sleeves and the sealing ring constitute a piston that matches the inner cavity of the bending roll cylinder. Figure 1 During the production process, acidic emulsion easily enters the cavity of the roll bending cylinder. At the same time, the piston rod working position, that is, the piston rod sealing ring, is under the action of 12Mpa high-pressure oil, which continuously erodes and scours the side wall of the corresponding cavity inner hole. Over time, the position of the inner hole of the roll bending cylinder will wear and increase in size, eventually leading to piston seal failure, internal leakage in the roll bending cylinder, reduced roll bending force, and inability to meet normal production needs. Utility Model Content

[0003] The purpose of the utility model is to provide a reversible rolling mill bending cylinder to avoid internal leakage in the inner hole of the bending cylinder cavity, ensure that the bending force can meet the normal use of the rolling mill, extend the service life of the bending cylinder, and solve the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A reversible rolling mill bending cylinder comprises a piston rod, a guide sleeve, a seal and a bending cylinder body. Two seals and a guide sleeve are installed on the piston rod. The guide sleeve is located between the two seals. The two seals and the guide sleeve constitute a piston that matches the inner hole of the bending cylinder body cavity.

[0006] The piston rod is in the shape of a stepped cylinder with one end being thick and the other end being thin. Two sealing members and a guide sleeve are respectively mounted on the thick end of the piston rod.

[0007] The thick end of the piston rod is provided with three clamping grooves matched with two sealing members and a guide sleeve.

[0008] The sealing element is a Gley sealing ring composed of an O-type rubber sealing ring and a square sealing ring filled with polytetrafluoroethylene.

[0009] The beneficial effects of the utility model are: by optimizing the piston rod structure, the wear position of the inner hole of the bending roll cylinder cavity is staggered, internal leakage of the inner hole of the bending roll cylinder cavity is avoided, the bending roll force is ensured to meet the normal use of the rolling mill, and the service life of the bending roll cylinder is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the background technology bending roller cylinder assembly diagram;

[0011] Figure 2 This is the assembly drawing of the bending roller cylinder of the utility model;

[0012] Figure 3 This is a schematic diagram of the piston rod of the utility model;

[0013] In the figure: piston rod 1, guide sleeve 2, seal 3, bending roll cylinder 4, rolling mill arch 5, pressure cover 6, bolt 7, and slot 8. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] Refer to the attached Figure 2 、 3 A reversible rolling mill bending cylinder includes a piston rod 1, a guide sleeve 2, a seal 3 and a bending cylinder body 4. Two seals 3 and a guide sleeve 2 are installed on the piston rod 1. The guide sleeve 2 is located between the two seals 3. The two seals 3 and the guide sleeve 2 constitute a piston that matches the inner hole of the bending cylinder body 4.

[0016] Refer to the attached Figure 1 Two guide sleeves 2 and a seal 3 are installed on the piston rod 1. The two guide sleeves 2 are located on both sides of the seal 3. The two guide sleeves 2 and the seal 3 constitute a piston that matches the inner cavity of the bending roller cylinder. The seal 3 is a YX-type sealing ring. Position A is the working position of the piston rod, and the corresponding piston seal 3, that is, the wear position of the inner hole of the bending roller cylinder body 4 cavity, enters the cavity of the bending roller cylinder. Under the action of 12Mpa high-pressure oil, the side wall of the corresponding cavity inner hole, that is, position A, is continuously eroded and washed. Over time, the position of the inner hole of the bending roller cylinder will wear and increase in size, which will eventually lead to failure of the piston seal, internal leakage of the bending roller cylinder, reduced bending force, and inability to meet normal production needs.

[0017] Refer to the attached Figure 2 、 3 , the structure of the piston rod 1 is redesigned. The piston rod 1 adopts a stepped cylindrical shape with one end thick and the other end thin. Three grooves 8 are set at the thick end, among which the middle groove 8 is installed with the guide sleeve 2, and the grooves 8 on both sides are installed with the seal 3. Among them, the seal 3 is composed of an O-type rubber sealing ring and a square sealing ring filled with polytetrafluoroethylene. The Gley sealing ring is a high-pressure hydraulic cylinder seal commonly used in this field. It can squeeze the square sealing ring through the elastic deformation of the O-ring, so that it is close to the sealing surface, thereby generating a higher additional contact stress that increases with the pressure of the pressure liquid, and together with the initial contact stress, it prevents the leakage of the pressure liquid.

[0018] Compared with the traditional YX-type sealing ring, the Glyer sealing ring focuses more on sealing in a single direction, and in some high-pressure and high-speed application scenarios, its wear resistance and anti-extrusion ability are relatively weak, and its sealing effect is slightly inferior to that of the Glyer sealing ring.

[0019] The utility model optimizes the piston rod structure, staggers the wear position of the inner hole of the bending roller cylinder to determine the piston seal position, and reselects the piston seal form. It can effectively solve the wear and leakage of the inner hole of the bending roller cylinder at a low cost and in a short period of time, and ensure the normal use of the bending roller cylinder output.

Claims

1. A reversible rolling mill roll bending cylinder, characterized in that: The invention comprises a piston rod (1), a guide sleeve (2), a seal (3) and a bending roller cylinder body (4). Two seals (3) and a guide sleeve (2) are installed on the piston rod (1). The guide sleeve (2) is located between the two seals (3). The two seals (3) and the guide sleeve (2) form a piston that matches the inner hole of the bending roller cylinder body (4).

2. The reversible rolling mill roll bending cylinder according to claim 1, characterized in that: The piston rod (1) is in the shape of a stepped cylinder with one end being thicker and the other end being thinner. Two sealing members (3) and a guide sleeve (2) are respectively mounted on the thick end of the piston rod (1).

3. The reversible rolling mill roll bending cylinder according to claim 2, characterized in that: Three slots (8) matching with two sealing members (3) and a guide sleeve (2) are provided at the thick end of the piston rod (1).

4. The reversible rolling mill roll bending cylinder according to claim 3, characterized in that: The sealing member (3) is a Gley sealing ring composed of an O-type rubber sealing ring and a square sealing ring filled with polytetrafluoroethylene.

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