Electromagnetic grabbing device for picking up iron magnetic objects

Abstract

The invention provides an electromagnetic grabbing device for picking up iron magnetic objects, and belongs to the field of mechanical devices. The electromagnetic grabbing device comprises a base, a cable, columnar electromagnets, blocking pieces and clamping pieces. A plurality of fixing through holes are formed in the base. The blocking pieces are arranged in the fixing through holes. Conical holes with diameters gradually decreased from top to bottom are formed in the blocking pieces. Conical surfaces with diameters gradually decreased from top to bottom are arranged on the outer surfaces of the clamping pieces. The clamping pieces are inserted in the conical holes. The clamping pieces and the blocking pieces are provided with central through holes. The columnar electromagnets are inserted in the central through holes. The cable, on one hand, is fixedly connected with the base, and on the other hand, is electrically connected with the columnar electromagnets. By means of the electromagnetic grabbing device, even when the upper surface of a falling object is of a non-planar structure, the bottoms of the columnar electromagnets can act on the upper surface of the falling object, the contact area between the columnar electromagnets and the falling object is large, and large magnetic attraction force can be provided after power-on; thus, falling objects complex in shape and large in mass can be picked up.

Description

technical field [0001] The invention relates to the field of mechanical equipment, in particular to an electromagnetic grabbing device for picking up ferromagnetic objects. Background technique [0002] In fields such as oil, natural gas, coal bed methane, shale gas, and geothermal wells, drilling, completion, and workover operations are required. When workers are working in the well, there are often accidents where tools (such as drill bits, grinding shoes, weighted rods, ignition rods, steel wire tools, cable tools, etc.) fall into the bottom of the well. Therefore, in the prior art, picking is generally accomplished by mechanical claw equipment. [0003] The mechanical claws in the prior art generally simulate the action of a hand or claw through the deformation of the mechanical claws to grab falling objects. [0004] For example, the invention patent (patent name: a kind of downhole fishing tool; application date: 2007.07.09; ) disclosed a mechanical claw with the app...

AI Technical Summary

Problems solved by technology

[0010] But in the electromagnetic pick-up device in the prior art, its electromagnet 8 ' is all disc-shaped, and when this shape acts on the plane, can provide bigger magnetic attraction force; figure 2 As shown in the spherical falling object 9', the contact area between the disc-shaped structure and the spherical falling object 9' is very small, and the magnetic attraction force that can be provided is small, so the weight of the falling object that can be picked up is relatively low; drop

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