Non-magnetic oil cylinder of intermediate frequency furnace

Abstract

The non-magnetic oil cylinder of the intermediate frequency furnace comprises a cylinder barrel, a piston, a piston rod and two end covers, an oil cavity is defined by the cylinder barrel and the two end covers, the piston is arranged in the oil cavity in a matched mode, and one end of the piston rod penetrates through the end covers to be connected with the piston. Magnetic shielding covers are arranged on the outer walls of the cylinder barrel and the two end covers, and an oil inlet and an oil outlet of the cylinder barrel penetrate through the magnetic shielding covers; and a telescopic magnetic shielding sleeve capable of moving along with the piston rod and resisting magnetism is arranged between the telescopic end of the piston rod and the end cover corresponding to the telescopic end. The oil cylinder can effectively eliminate the phenomenon that the cylinder barrel, the piston, the piston rod and the end cover generate heat due to eddy current induction, the safety and reliability of the oil cylinder are greatly improved, the service life of the oil cylinder is prolonged, and the using effect is remarkable.

Description

Technical Field

[0001] The utility model relates to the technical field of electric furnaces, in particular to a non-magnetic oil cylinder of a medium frequency furnace. Background Art

[0002] The medium frequency electric furnace cylinder is the main component of the medium frequency smelting equipment. During use, the medium frequency furnace induction coil generates a magnetic field, and the induction coil inevitably has a magnetic leakage problem. The various components of the medium frequency electric furnace cylinder will cause heating problems due to eddy currents generated by induction. Long-term heating causes continuous temperature increases, which will cause the performance of the cylinder to decline, greatly reducing reliability and life, and needs to be improved. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a medium frequency furnace non-magnetic cylinder, which can effectively eliminate the phenomenon of heating due to induced eddy currents, greatly improve the safety and reliability of the cylinder, extend the service life of the cylinder, have significant use effects, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a non-magnetic oil cylinder for a medium frequency furnace, comprising a cylinder barrel, a piston, a piston rod and two end covers, wherein the cylinder barrel and the two end covers form an oil chamber, the piston is adapted in the oil chamber, and one end of the piston rod passes through the end cover and is connected to the piston; a magnetic shielding cover is provided on the outer walls of the cylinder barrel and the two end covers, and the oil inlet and outlet of the cylinder barrel pass through the magnetic shielding cover; a telescopic magnetic shielding cover that can move with the piston rod and block magnetism is provided between the telescopic end of the piston rod and the end cover corresponding to the telescopic end.

[0005] Preferably, the magnetic shielding cover includes a magnetic isolation sleeve and two magnetic isolation plates. The magnetic isolation sleeve is gap-fitted with the cylinder barrel, one end of the magnetic isolation sleeve is fixedly connected to one of the magnetic isolation plates, and the magnetic isolation plate abuts against one of the end covers, and the other end of the magnetic isolation sleeve is connected to the other magnetic isolation plate by bolts, and the magnetic isolation plate abuts against the other end cover.

[0006] Preferably, one of the magnetic isolation plates is provided with a through hole adapted to the piston rod, and a ceramic sealing ring is provided on the contact surface between the magnetic isolation plate and the piston rod.

[0007] Preferably, the telescopic magnetic shielding sleeve is coaxially arranged with the piston rod, and the two ends of the telescopic magnetic shielding sleeve are respectively fixedly connected with the end cover and the telescopic end of the piston rod, and the telescopic magnetic shielding sleeve includes a plurality of magnetic isolation cylinders which are movably sleeved in sequence.

[0008] Preferably, the cylinder, piston, piston rod and end cover are all made of 20Mn23AlSiMoTi non-magnetic steel material.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows: by providing a magnetic shielding cover on the outer walls of the cylinder barrel and the two end covers, and a telescopic magnetic shielding sleeve that can follow the movement of the piston rod, the phenomenon of heating of the cylinder barrel, piston, piston rod and end covers due to induced eddy currents can be effectively eliminated, thereby greatly improving the safety and reliability of the oil cylinder. Moreover, the cylinder barrel, piston, piston rod and end covers are all made of non-magnetic steel material, with good magnetic resistance effect, thereby extending the service life of the oil cylinder and achieving significant use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 It is an enlarged schematic diagram of the local structure of the utility model.

[0012] In the figure: 1 cylinder, 2 piston, 3 piston rod, 4 telescopic magnetic shielding sleeve, 5 ceramic sealing ring, 6 magnetic isolation sleeve, 7 end cover, 8 magnetic isolation plate, 9 bolt. DETAILED DESCRIPTION

[0013] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0014] See also Figure 1-2 The utility model provides a technical solution: a non-magnetic oil cylinder of a medium frequency furnace, comprising a cylinder barrel 1, a piston 2, a piston rod 3 and two end covers 7, the cylinder barrel 1 and the two end covers 7 enclose an oil chamber, the piston 2 is adapted in the oil chamber, one end of the piston rod 3 passes through the end cover 7 and is connected with the piston 2; a magnetic shielding cover is provided on the outer wall of the cylinder barrel 1 and the two end covers 7, and the oil inlet and outlet of the cylinder barrel 1 pass through the magnetic shielding cover; a telescopic magnetic shielding sleeve 4 that can move with the piston rod 3 and block magnetism is provided between the telescopic end of the piston rod 3 and the end cover 7 corresponding to the telescopic end;

[0015] It can be understood that by providing a magnetic shielding cover on the outer wall of the cylinder 1 and the two end covers 7, and a telescopic magnetic shielding sleeve 4 that can follow the movement of the piston rod 3, electromagnetic shielding and blocking the magnetic field from entering the various components of the cylinder can effectively eliminate the phenomenon of heating of the cylinder 1, the piston 2, the piston rod 3 and the end cover 7 due to induced eddy current, which greatly improves the safety and reliability of the cylinder and prolongs its service life;

[0016] Furthermore, the magnetic shielding cover includes a magnetic isolation sleeve 6 and two magnetic isolation plates 8, the magnetic isolation sleeve 6 is loosely matched with the cylinder barrel 1, one end of the magnetic isolation sleeve 6 is fixedly connected to one of the magnetic isolation plates 8, the magnetic isolation plate 8 is in contact with one of the end covers 7, the other end of the magnetic isolation sleeve 6 is connected to the other magnetic isolation plate 8 by bolts 9, the magnetic isolation plate 8 is in contact with the other end cover 7, that is, the magnetic isolation sleeve 6 is sleeved on the cylinder barrel 1, the magnetic isolation plate 8 on one side is fixed to the magnetic isolation sleeve 6, and the magnetic isolation plate 8 on the other side is connected to the magnetic isolation sleeve 6 by bolts 9, which is convenient for disassembly and installation; one of the magnetic isolation plates 8 is provided with a through hole adapted to the piston rod 3, and the contact surface between the magnetic isolation plate 8 and the piston rod 3 is provided with a ceramic sealing ring 5, which has high temperature resistance, anti-magnetic, wear resistance and many other characteristics;

[0017] Furthermore, the telescopic magnetic shielding sleeve 4 is coaxially arranged with the piston rod 3, and the two ends of the telescopic magnetic shielding sleeve 4 are respectively fixedly connected with the end cover 7 and the telescopic end of the piston rod 3, and the telescopic magnetic shielding sleeve 4 includes a plurality of magnetic isolation cylinders that are movably sleeved in sequence, that is, during the telescopic process of the piston rod 3, the telescopic magnetic shielding sleeve 4 will also be correspondingly telescoped, thereby providing magnetic blocking protection for the piston rod 3;

[0018] Specifically, the cylinder 1, the piston 2, the piston rod 3 and the end cover 7 are all made of 20Mn23AlSiMoTi non-magnetic steel material. The magnetic permeability of 20Mn23AlSiMoTi non-magnetic steel material is ≤1.05, the temperature resistance can reach 850°, it is almost non-magnetic in the magnetic field, the induced eddy current can be ignored and almost no heat is generated.

[0019] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended to include all changes that fall within the meaning and scope of equivalent elements in the content of the present invention.

Claims

1. A non-magnetic oil cylinder for a medium frequency furnace, comprising a cylinder barrel (1), a piston (2), a piston rod (3) and two end covers (7), characterized in that: The cylinder barrel (1) and the two end covers (7) form an oil chamber, the piston (2) is adapted to fit in the oil chamber, and one end of the piston rod (3) passes through the end cover (7) and is connected to the piston (2); the outer walls of the cylinder barrel (1) and the two end covers (7) are provided with a magnetic shielding cover, and the oil inlet and outlet of the cylinder barrel (1) pass through the magnetic shielding cover; and a telescopic magnetic shielding sleeve (4) capable of moving with the piston rod (3) and blocking magnetism is provided between the telescopic end of the piston rod (3) and the end cover (7) corresponding to the telescopic end.

2. The non-magnetic oil cylinder for medium frequency furnace according to claim 1, characterized in that: The magnetic shielding cover comprises a magnetic shielding sleeve (6) and two magnetic shielding plates (8); the magnetic shielding sleeve (6) is loosely matched with the cylinder barrel (1); one end of the magnetic shielding sleeve (6) is fixedly connected to one of the magnetic shielding plates (8), and the magnetic shielding plate (8) abuts against one of the end covers (7); the other end of the magnetic shielding sleeve (6) is connected to the other magnetic shielding plate (8) via bolts (9), and the magnetic shielding plate (8) abuts against the other end cover (7).

3. The non-magnetic oil cylinder of a medium frequency furnace according to claim 2, characterized in that: One of the magnetic isolation plates (8) is provided with a through hole adapted to the piston rod (3), and a ceramic sealing ring (5) is provided on the contact surface between the magnetic isolation plate (8) and the piston rod (3).

4. The non-magnetic oil cylinder for medium frequency furnace according to claim 1, characterized in that: The telescopic magnetic shielding sleeve (4) is coaxially arranged with the piston rod (3), and the two ends of the telescopic magnetic shielding sleeve (4) are respectively fixedly connected to the end cover (7) and the telescopic end of the piston rod (3), and the telescopic magnetic shielding sleeve (4) comprises a plurality of magnetic shielding cylinders that are movably sleeved in sequence.

5. The non-magnetic oil cylinder for medium frequency furnace according to claim 1, characterized in that: The cylinder barrel (1), the piston (2), the piston rod (3) and the end cover (7) are all made of 20Mn23AlSiMoTi non-magnetic steel material.

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