A permanent magnet hoisting device

Abstract

The invention belongs to hoisting slings and particularly relates to a permanent magnet hoisting device. The permanent magnet hoisting device comprises a permanent magnet box. Two rotating magnets respectively driven by two rotating shafts are installed in the permanent magnet box. The rotation of the two rotating shafts can open and close a permanent magnet circuit. The two rotating shafts are disposed in parallel. Ends of the two rotating shafts are respectively provided with a transmission gear. The permanent magnet hoisting device also comprises a driving gear driven by a motor with a braking function. The driving gear drives the two transmission gears to rotate synchronously in opposite directions by an intermediate gear. The permanent magnet hoisting device has characteristics of simple structure, long service lifetime, safety, reliability, large transmission torque, high magnetic field and large magnetic field depth.

Description

Technical field [0001] The present invention is a lifting piano, which is specifically a permanent magnet lifting device. Background technique [0002] The lifting forever magnets and the lifting electromagnets are widely used in steel mills, steel libraries, scrap steel treatment plants, shipyards, large casting plants, heavy mechanical manufacturing plants, port terminals and stations.Its main product types include: [0003] 1. Small lifesteps permanent magnet: The magnetic circuit design of a single -axis and single magnetic circuit gap determines that this type of permanent magnet heavy device has only a strong surface magnetic field strength, and it cannot have a large magnetic field depth.It is impossible to be applied to large -scale lifting equipment, and it is not possible to be applied to waste steel. It is limited to the inhalation and hanging of small piece of plane.Other permanent magnets suction tablets with leveraged structures cannot be turned off, which cannot be...

AI Technical Summary

Problems solved by technology

But it also has the following disadvantages: ①It is easy to drop steel when it fails, which is unsafe; ②Rely on electricity to generate a magnetic field, which consumes energy; ③Power failure requires power-off protection; ④Has hysteresis and low work efficiency; Large drop in suction force; ⑥High maintenance cost; ⑦Short life; ⑧Towing cable operation

[0005] Chinese patent 02138572.6 discloses a magnetic circuit switch that can be used for permanent magnet lifting devices. The rotating magnet and several fixed magnets together form a double (multi) axis and double (multi) gap magnetic circuit, which not only has a high surface magnetic field strength, but also has a considerable magnetic field depth. However, due to the small size of the permanent magnet box, the two The root shaft needs to be driven with a large torque. At present, the structure of various driving devices with this structure is too complicated. The hydraulic driving device is prone to oil leakage after long-term use. Other mechanical driving devices have short service life, high maintenance costs, and low reliability of transmission operation.

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