CN2161590Y

CN2161590Y - Permanent-magnet hoist

Info

Publication number: CN2161590Y
Application number: CN 93225854
Authority: CN
Inventors: 陈钧台
Original assignee: Individual
Current assignee: Zhang Zhanming
Priority date: 1993-06-12
Filing date: 1993-06-12
Publication date: 1994-04-13
Anticipated expiration: 2003-06-12

Abstract

The utility model provides a permanent-magnet hoisting jack. The conventional permanent-magnet hoisting jacks change the working and the closing states of the hoisting jack through turning a whole rotor, having the disadvantages of large operating force of operating the rotor to rotate and having magnetic force line leakage in the state of closing. The utility model improves the conventional permanent-magnet hoisting jack; the permanent magnet in the rotor is divided into two parts; one part of the permanent magnet is fixed on a housing, and forms a fixing permanent magnet; the other part and a magnetic conductor form the rotor. In this way, the volume of the rotor is reduced, and the operating force of the rotor is decreased.

Description

Permanent-magnet hoist

The utility model relates to a kind of permanent magnetic lifter, relates to a kind of permanent magnetic lifter that uses rareearth magnetic material particularly.

Referring to Fig. 1, China Patent No. is that 90222661.4 utility model patent discloses a kind of permanent magnetic lifter, and it comprises rotor 101, handle the state exchange mechanism (not shown) that rotor 101 rotates, the parts such as housing 102 that hold above-mentioned rotor 101.Rotor 101 is made of upper semi-circle magnetizer 103a, lower half circle magnetizer 103b and permanent magnet 104; The last isolating bar 105 that housing 102 is made by the non-magnetic material constitutes with following isolating bar 106 and by left shell 107 and right shell body 108 that permeability magnetic material is made.Permanent magnetic lifter shown in Figure 1 is in closed condition.The permanent magnet 104 of rotor 101 is horizontal, and its magnetic circuit is shown in dotted line 109, and the direction of magnetization is a vertical direction.The lower surface of supposing permanent magnet 104 is the N utmost point, and upper surface is the S utmost point, and then magnetic line of force turns back to the upper surface of permanent magnet 104 again through the second semicircle magnetizer 103b and left shell 107 and right shell body 108 to first semicircle magnetizer 103a from the lower surface of permanent magnet 104.Form closed magnetic circuit.The external space does not present magnetic in the bottom of permanent magnet 104, and permanent magnetic lifter is in closed condition, can not attract the object that will lift by crane.

As shown in Figure 2, the permanent magnet 104 that Fig. 2 shows the magnetic circuit this moment rotor 101 of permanent magnetic lifter when in running order is in vertical position, its magnetic circuit is shown in dotted line 110, magnetic line of force is right surperficial through the first semicircle magnetizer 103a, right shell body 108 from permanent magnet 104, turn back to left shell 108 by the external space of Jack below or the object that will lift by crane below it again, through the left surface of the second semicircle magnetizer 103b, form closed magnetic circuit again to permanent magnet 104.

From top description as can be seen, permanent magnetic lifter closed condition and conversion of operation state realize by making rotor 101 rotate 90 °.When being in closure state, the magnetic line of force of the permanent magnet 104 of rotor 101 N utmost point from permanent magnet 104 under the effect of magnetizer 103a, the 103b of rotor 101 and left shell 107, right shell body 108 is directed to the S utmost point.Thereby guarantee that magnetic line of force is not presented on the Jack below external space.The weak point that this Jack exists is that actuating force used by state exchange mechanism operating rotor rotation the time is bigger, especially for the large-tonnage Jack.On the other hand, as can be seen from Figure 1, when Jack is in closure state, by magnetic line of force is arranged, there is magnetic line of force to leak into the Jack below external space unavoidably in the Jack bottom.

The purpose of this utility model is to provide the less permanent magnetic lifter of actuating force of a kind of state exchange mechanism, can realize the large-tonnage Jack.

Another purpose of the present utility model is to provide a kind of permanent magnetic lifter, when being in closure state Jack below do not have magnetic line of force substantially and leak.

Design of the present utility model is such.Permanent magnet in the rotor is divided into two ones sends out, wherein a part is fixed on the housing, forms standing field; Moving permanent magnet of another part and magnetizer constitute rotor, form rotatable magnetic field, and this rotor is operated by state exchange mechanism.When the permanent magnet in the rotor forwards to when identical with fixed permanent magnet polarity position, standing field and rotatable magnetic field is superposition in the same way, and magnetic field is presented on the Jack below external space, and this moment, permanent magnetic lifter was in running order.If with 180 ° of rotor rotation, permanent magnet in the rotor and fixed permanent magnet polarity position opposite, two permanent magnets form closed magnetic circuit by rotor magnetizer and the housing of being made by magnetic conductive material each other, make the Jack below external space magnetic field not occur, permanent magnetic lifter is in closure state (off working state).

From above-described structure as can be seen, under the identical condition of Jack tonnage.What the volume ratio of the permanent magnet in the permanent magnetic lifter rotor of the present utility model was traditional reduces half, so the actuating force of rotary rotor also reduces greatly.

Permanent magnetic lifter of the present utility model comprises rotor, the housing that holds described rotor that is made of moving permanent magnet and magnetizer, the state exchange mechanism that handles rotor rotation and fixing note permanent magnet, described rotor can rotate in housing, and described fixed permanent magnet magnetizes with horizontal direction; When permanent magnetic lifter was in closure or mode of operation, moving permanent magnet and fixed permanent magnet were a straight line in vertical direction.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Fig. 1, Fig. 2 are the structural representations of traditional permanent magnetic lifter; Permanent magnetic lifter shown in Fig. 1 is in closed condition; Permanent magnetic lifter shown in Fig. 2 is in running order;

Fig. 3 is a permanent magnetic lifter cross-sectional schematic of the present utility model;

Fig. 4 is the A-A cutaway view of Fig. 3;

Fig. 5 is the magnetic circuit scheme drawing of permanent magnetic lifter when in running order;

Fig. 6 is the magnetic circuit scheme drawing of permanent magnetic lifter when being in closed condition.

Referring to Fig. 3, Fig. 4, permanent magnetic lifter of the present utility model comprises rotor 1, housing unit 2 and state exchange mechanism 3, and described rotor 1 is positioned at housing unit 2, handles rotor 1 by state exchange mechanism 3 and rotates.In the present embodiment, state exchange mechanism adopts Handleset 3, also can the electricity consumption flowing mode, promptly be used for driving rotor rotation by change speed gear box with electrical motor.Rotor 1 is made of moving permanent magnet 11, the first semicircle magnetizers 12 of rectangle and the second semicircle magnetizer 13, and the moving permanent magnet 11 of rectangle is clipped between above-mentioned two semicircle magnetizers 12,13.Housing unit 2 is made of left shell 21, right shell body 22, last isolating bar 23, following isolating bar 24, front end cover 25 and rear side housing 26.Rotor 1 is positioned at housing 2.The both ends of rotor 1 are fixed on front end cover 25 and the rear side housing 26 by bearing 91,92, and rotor 1 can be rotated in housing 2.Left shell 21 in the housing unit 2, right shell body 22 are made by the non-magnetic material and go up isolating bar 23 times isolating bars 24, front end cover 25 and rear side housings 26 by making such as magnetic conductive materials such as steel.A circular hole 25a is arranged on front end cover 25, and rotor 1 stretches out this circular hole 25a, and Handleset 3 is captiveed joint with the part 14 that rotor 1 stretches out front end cover 25 circular hole 25a.By Handleset 3 rotatable rotors 1.

As shown in Figure 3, Figure 4, above the rotor, be provided with a fixed permanent magnet 4 between right shell body 21 and the right shell body 23, the moving permanent magnet 11 in this fixed permanent magnet 4 and the rotor can be made with rare earth permanent-magnetic material, for example Nd-Fe-B permanent magnet.In the present embodiment, permanent magnetic lifter also includes suspension ring 5, and suspension ring 5 link to each other with housing 2 by suspension ring axle 51.

The principle of work of this permanent magnetic lifter is described below in conjunction with Fig. 5, Fig. 6.

Referring to Fig. 5, fixed permanent magnet 4 supposes that with the horizontal direction magnetization its left side is the N utmost point, and the right side is the S utmost point, and the moving permanent magnet 11 of rotor 1 magnetizes with thickness direction.If rotor 1 forwards position as shown in Figure 5 under the manipulation of Handleset 3, promptly the left side is the N utmost point, and the right side is the S utmost point very, then shown in the magnetic circuit dotted line 93 of fixed permanent magnet 4 and moving permanent magnet 11.For fixed permanent magnet 4, magnetic line of force sends from the N utmost point, side space and turn back to the S utmost point by the right shell body 22 that magnetic conductive material is made under the left shell of making via magnetic conductive material 21, the Jack.For moving permanent magnet 11, magnetic line of force sends from the N utmost point, and side space and right shell body 22 and the second semicircle magnetizer 13 turn back to the S utmost point under the first semicircle magnetizer 12, right shell body 21, Jack successively.Under this state, the magnetic field of stack in the same way that the Jack below exists two permanent magnets 4,11 to form, in running order (promptly attracting the lifting state).

Referring to Fig. 6, if by handle mechanism 3 rotor 1 is rotated 180 °, then the magnetic circuit of fixed permanent magnet 4 and moving permanent magnet 11 is shown in Fig. 6 dotted line 94.At this moment, moving permanent magnet 11 left sides of rotor 1 are the S utmost point, and the right side is the N utmost point.The magnetic line of force that the fixed permanent magnet 4N utmost point sends arrives the S utmost point that moves permanent magnet 11 through left shell 21, the second semicircle magnetizer 13, forms magnetic loop; The magnetic line of force that the N utmost point of moving permanent magnet 11 sends forms magnetic loop through the N utmost point that the first semicircle magnetizer 12, right shell body 22 arrive fixed permanent magnet 11.At this moment, below Jack, there is not magnetic field, so be in closed condition.

As can be known from Fig. 5 and Fig. 6, the in running order still closed condition of permanent magnetic lifter no matter, moving permanent magnet 11 and fixed permanent magnet 4 are on the straight line in vertical direction all the time.

Claims

1, a kind of permanent magnetic lifter, comprise the rotor that constitutes by moving permanent magnet and magnetizer, hold described the rotor housing that rotates of portion and the state exchange mechanism that handles rotor rotation within it, it is characterized in that also comprising a fixed permanent magnet, the direction of magnetization of described fixed permanent magnet is a horizontal direction, when permanent magnetic lifter was in closure or mode of operation, moving permanent magnet and fixed permanent magnet were a straight line in vertical direction.

2, permanent magnetic lifter as claimed in claim 1, it is characterized in that described rotor by bearing fixing on housing.