JPH0912259A - Lifting device - Google Patents

Abstract

PURPOSE: To enable smooth attracting work by alternately arranging magnetic substances and non-magnetic substances in the width direction of a pole piece. CONSTITUTION: The contact areas of pole pieces 11a, 11b with yokes 7a, 7b are decreased with the rotation of a cylindrical magnet body 12. Since magnetic substances and non-magnetic substances are alternately arranged in the width direction, the pole pieces 11a, 11b are magnetically divided from each other. Therefore, there is no passage of a line of magnetic force on a part in which the pole pieces 11a, 11b are in contact with spacers 8a, 8b, and magnetic force of a magnetic circuit to pass the cylindrical magnet body 12 is decreased. The lines of magnetic force 15a, 16a incapable of passing the cylindrical magnet body 12 constitutes a new magnetic circuit in which they enter an object to be attracted 14 through the yoke 7a and an attaching surface 6a, pass the attracting surface 6b and the yoke 7b on the opposite side, and then return to a sub magnet 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type hoisting device for adsorbing and hoisting a magnetic material such as steel and using it for transportation, and more particularly to a device for switching attachment / detachment by rotating a built-in permanent magnet. Regarding

[0002]

2. Description of the Related Art As shown in FIG. 11, a conventional lifting device of this type has a magnetic circuit part 1 and a magnetic shield plate 2 made of a non-magnetic material.
And a substrate 3 having a suspending metal portion 4 for supporting the magnetic circuit portion via the, and these are integrally assembled by a bolt 5. The magnetic circuit unit 1 has a pair of yokes 7a made of a ferromagnetic material (iron, steel, etc.) having attraction surfaces 6a, 6b,
7b and spacers 8a, 8b made of a non-magnetic material (austenitic stainless steel, aluminum alloy, etc.) interposed between them, and the holes 9 formed between the yokes 7a, 7b and the spacers 8a, 8b. Have.
Inside the hole 9, a rotatable cylindrical magnet body 12 including a pair of pole pieces 11a and 11b having different polarities and a main magnet 10 is arranged on the outer peripheral surface. Further, a sub magnet 13 magnetized in the same direction as the pair of yokes is fixed to the upper portion of the spacer 8a.

In FIG. 11, the magnetic pole on the right side of the paper of the sub magnet 13 is an N pole, and the magnetic pole on the right side of the paper of the main magnet 10 is an S pole.
Magnetic field lines 15a, 16a generated from the N pole of the sub magnet 13,
After passing the main magnet 10 through the yoke 7a and the pole piece 11a, 17a and 18a pass through the pole piece 11 on the opposite side.
b, a magnetic circuit passing through the yoke 7b and returning to the sub magnet 13 is configured. That is, since the attraction surfaces 6a and 6b are in a non-excited state in which no magnetic force is generated, the lines of magnetic force do not pass through the object to be attracted 14 and the lifting function does not work.

The cylindrical magnet body 12 is moved from the position shown in FIG.
The state of being rotated by ° is shown in FIG. In FIG. 13, the main magnet 10
Also, the magnetic poles of the sub-magnet 13 are both N poles on the right side of the drawing and are in a repulsive state. That is, since the attraction surfaces 6a and 6b are in an excited state in which a magnetic force is generated, the magnetic force lines 15 generated from the N poles on the right side of the main magnet 10 and the sub magnet 13 in the drawing surface.
a, 16a, 17a and 18a are the yoke 7a and the suction surface 6
A magnetic circuit is formed which enters the object to be attracted 14 via a, passes through the attraction surface 6b and the yoke 7b on the opposite side, and then returns to the S pole on the left side of the main magnet 10 and the sub magnet 13 in the drawing. That is, the lifting function works and the object 14 can be lifted.

FIG. 12 shows a state in which the cylindrical magnet body 12 is rotated counterclockwise by 45 ° from the position shown in FIG. In FIG. 12, the pole piece 11 is rotated along with the rotation of the cylindrical magnet body 12.
The contact area between a and 11b and the yoke 7a and the yoke 7b is reduced. Therefore, the magnetic force line generated from the N pole of the sub magnet 13 is curved inside the pole pieces 11a and 11b, but constitutes a magnetic circuit that returns to the S pole of the sub magnet 13 via the main magnet 10 as in FIG. Therefore, it can be understood that the magnetic circuit is not formed on the object to be attracted 14 and the magnetic circuit configuration and the magnetic force are not changed during the transition from FIG. 11 to FIG.

The freely rotatable cylindrical magnet body is most stable against the rotational force when it constitutes a magnetic circuit with a strong magnetic force with the sub magnet or the object to be attracted through the yoke. When the orientation of the magnetic poles of the cylindrical magnet body reaches the vicinity of the magnetic poles, a magnetic rotational attraction force that tends to approach a stable state is generated with a change in magnetic force with rotation. Therefore, in order for the cylindrical magnet body to rotate smoothly, it is desirable that the magnetic force of the magnetic circuit passing through the yoke changes with the rotation of the cylindrical magnet body.

[0007]

However, since the conventional hoisting device does not magnetically change due to the rotation of the cylindrical magnet body as described above when performing the suction work, a high rotating torque is always kept above a certain level. However, there is a problem in that the cylindrical magnet body is not rotated smoothly. It is an object of the present invention to solve the problems existing in the above-mentioned conventional techniques and provide a hoisting device that enables a smooth suction operation.

[0008]

In order to achieve the above object, in the present invention, a pair of yokes facing each other via a spacer composed of a fixing sub-magnet and a non-magnetic material and each having an attracting surface. A yoke body having a cylindrical hole formed by the spacer and the yoke; a cylindrical magnet body rotatably arranged in the hole; and a pair of different polarities on the outer peripheral surface of the cylindrical magnet body. In a hoisting device having a magnetic circuit structure constituted by a pole piece of
A technical means of alternately arranging a magnetic material and a non-magnetic material in the width direction of the pole piece was adopted. Further, in the present invention, a plurality of slits may be provided in the width direction of the pole piece.

[0009]

According to the above construction, since the magnetic force of the magnetic circuit passing through the yoke changes with the rotation of the cylindrical magnet body in the attraction work, the attraction work can be carried out smoothly.

[0010]

EXAMPLE An example of a pole piece according to the present invention is shown in FIG. In FIG. 1, the magnetic pieces 20 and the non-magnetic portions 21 are alternately arranged in the pole piece 19 in the width direction (horizontal direction of the paper surface). FIG. 2 shows a cylindrical magnet body 12 provided with the pole piece 19 shown in FIG. The magnetic material portion and the non-magnetic material portion may be formed of the same materials as the above-mentioned yoke and spacer, respectively.

FIG. 3 shows an example of a hoisting device equipped with the cylindrical magnet body 12 shown in FIG. In FIG. 3, parts having the same functions as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. The hoisting device shown in FIG. 3 is in a non-excited state, and constitutes a magnetic circuit similar to that of the conventional example shown in FIG.

FIG. 4 shows a state in which the cylindrical magnet body 12 is rotated counterclockwise by 45 ° from the position shown in FIG. In the state shown in FIG. 4, the contact area between the pole pieces 11a and 11b and the yoke 7a and the yoke 7b decreases as the cylindrical magnet body 12 rotates, as in the conventional example shown in FIG. However, unlike FIG. 12, in FIG. 4, the pole pieces 11a and 11b are magnetically divided because magnetic bodies and non-magnetic bodies are alternately arranged in the width direction. Therefore, no line of magnetic force passes through the portion where the pole pieces 11a, 11b are in contact with the spacers 8a, 8b, and the magnetic force of the magnetic circuit passing through the cylindrical magnet body 12 is reduced. The magnetic force lines 15a and 16a that cannot pass through the cylindrical magnet body 12 enter the attracted object 14 through the yoke 7a and the attracting surface 6a, and the attracting surface 6 on the opposite side.
b, after passing through the yoke 7b, a new magnetic circuit returning to the sub magnet 13 is started to be constructed.

FIG. 5 shows a state in which the cylindrical magnet body 12 is further rotated counterclockwise by 45 ° from the position shown in FIG. Since the pole pieces 11a and 11b are not in contact with the yokes 7a and 7b, the cylindrical magnet body 12 does not magnetically participate, and the magnetic force lines generated from the sub magnets 13 are attracted to the attracted object 14.
Only the magnetic circuit that passes through is constructed. In the state shown in FIG. 5, the cylindrical magnet body 12 is magnetically free, but when the magnetic poles of the cylindrical magnet body 12 are switched, the auxiliary magnet 13
It became clear that a high rotating torque is required temporarily for the magnetic poles.

According to the present embodiment, as described above, the magnetic force of the magnetic circuit passing through the cylindrical magnet body decreases with the rotation of the cylindrical magnet body. The body can be rotated smoothly.

FIG. 6 shows a state in which the cylindrical magnet body 12 is further rotated counterclockwise by 45 ° from the position shown in FIG. Sub magnet 13
The magnetic force lines 15a and 16a generated by the above-mentioned structure constitute a magnetic circuit that passes through the object to be attracted 14, as in FIG. Also,
When the pole piece 11b and the yoke 7a come into contact with each other, the magnetic force lines 17a generated from the cylindrical magnet body 12 also start to form a magnetic circuit that passes through the attracted object 14, so that the attracting force with respect to the attracted object increases.

FIG. 7 shows a state in which the cylindrical magnet body 12 further rotates counterclockwise by 45 ° from the position shown in FIG. As compared with the state of FIG. 6, the magnetic force lines generated from the cylindrical magnet body 12 and passing through the attracted substance 14 further increase. In the state of FIG. 7,
Since all the magnetic lines of force generated from the cylindrical magnet body 12 and the sub magnet 13 pass through the attracted object 14, they constitute one of the most stable magnetic circuits against rotation. By the series of operations from FIG. 3 to FIG. 7, the adsorption work of the adsorption target 14 is completed. Further, the work of removing the object 14 to be adsorbed can be smoothly performed by the series of work from FIG. 7 to FIG.

FIG. 8 shows another embodiment of the pole piece 22. In FIG. 8, the pole piece 22 is provided with a plurality of slit portions 24 in the width direction (horizontal direction of the paper surface). The plurality of slit portions 24 have a function of magnetically dividing the pole piece 22 similarly to the non-magnetic body portion 21 arranged in the pole piece 19 of the first embodiment. Therefore, the hoisting device (not shown) having the pole piece 22 installed therein can also smoothly perform the suction work as in the hoisting device of the first embodiment.

A hoisting device according to the present invention shown in FIG. 3 and FIG.
The conventional hoisting device shown in FIG. 1 was manufactured, and the results of comparing the rotational torques when rotating the cylindrical magnet body are described below. FIG. 9 shows a lifting device according to the present invention. The main dimensions and materials of each part are as follows. Yoke body 1: 130 × 90 × 200 mm Yokes 7a, 7b: SS41 Spacers 8a, 8b: SUS304 Cylindrical magnet body 12: φ45 × 200 mm Main magnet 10: 30 × 26 × 180 mm Nd-Fe-B system rare earth magnet (manufactured by Hitachi Metals) HS-40A
H) Secondary magnet 13: 30 × 13 × 200 mm / HS-40AH Pole piece 19: S45C Rotating handle 25: 15 × 18 × 250 mm / S45C In the conventional lifting device, the pole pieces 11a and 11b are made of SS41. Except for the above, the configuration is the same as that of the lifting device.

The results obtained by the rotary handle drive test using the above lifting device are shown in FIG. This test was conducted with the lifting device placed on a magnetic body (not shown). In FIG. 10, the horizontal axis represents the rotation angle of the cylindrical magnet body 12, and the vertical axis represents the relative torque required to rotate the cylindrical magnet body 12.

From FIG. 10, it can be understood that the conventional hoisting device has a higher relative torque and less change with respect to the rotation angle than the hoisting device according to the present invention. Further, in the case of the conventional lifting device, the rotation angle at which the magnetic poles of the cylindrical magnet body change
It was revealed that the relative torque temporarily became the highest in the vicinity of 0 °, and it was found that it was not practical.

On the other hand, in the case of the lifting device according to the present invention, the relative torque decreases as the rotation progresses from the non-excitation state, that is, the rotation angle of 0 °, and the rotation angle is 9 as in the conventional lifting device.
It was found that the relative torque temporarily increases near 0 °, but after the rotation angle of 90 °, the relative torque increases substantially symmetrically as the rotation progresses. Further, it was found that the relative torque required for the rotation of the cylindrical magnet body was significantly reduced as compared with the conventional hoisting device, and a smooth adsorption work could be performed.

[0022]

As described above, according to the present invention, by arranging the magnetic body and the non-magnetic body alternately in the width direction of the pole piece, the yoke is accompanied with the rotation of the cylindrical magnet body during the attraction work. Since a change occurs in the magnetic force of the magnetic circuit passing through, the smooth suction work becomes possible. Further, the same effect can be obtained by providing a plurality of slits in the width direction of the pole piece.

[Brief description of the drawings]

FIG. 1 is a front view of a pole piece according to an embodiment of the present invention.

FIG. 2 is a front view of a cylindrical magnet body according to an embodiment of the present invention.

FIG. 3 is a front view showing a non-excited state of the lifting device according to the embodiment of the present invention.

FIG. 4 is a front view showing an intermediate state between a non-excited state and an excited state of the lifting device according to the embodiment of the present invention.

FIG. 5 is a front view showing an intermediate state between a non-excited state and an excited state of the lifting device according to the embodiment of the present invention.

FIG. 6 is a front view showing an intermediate state between a non-excited state and an excited state of the lifting device according to the embodiment of the present invention.

FIG. 7 is a front view showing a magnetized state of the lifting device according to the embodiment of the present invention.

FIG. 8 is a front view of a pole piece according to another embodiment of the present invention.

FIG. 9 is a front view of the lifting device according to the embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between a rotation angle and a relative torque in a cylindrical magnet body.

FIG. 11 is a front view showing a non-excited state of a conventional hoisting device.

FIG. 12 is a front view showing an intermediate state between a non-excited state and an excited state of a conventional hoisting device.

FIG. 13 is a front view showing a magnetized state of a conventional hoisting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Yoke body, 2 ... Magnetic-shielding plate, 3 ... Board | substrate, 4 ... Hanging metal fitting part, 5 ... Bolt, 6a, 6b ... Adsorption surface, 7a, 7b ...
Yoke, 8a, 8b ... Spacer, 9 ... Hole, 10 ... Main magnet, 12 ... Cylindrical magnet body, 13 ... Sub magnet, 14 ... Adsorbed material 11a, 11b, 19, 19a, 19b, 22 ... Pole piece, 15a , 15b, 16a, 16b, 17a, 1
7b, 18a, 18b ... Magnetic force lines 20, 23 ... Magnetic part, 21 ... Non-magnetic part, 24 ... Slit, 25 ... Rotating handle

Claims (2)

[Claims] 1. A yoke having a pair of yokes facing each other with a spacer made of a fixing sub-magnet and a non-magnetic body, each having an attracting surface, and a cylindrical hole formed by the spacer and the yoke. In a hoisting device having a magnetic circuit structure composed of a body, a cylindrical magnet body rotatably arranged in the hole, and a pair of pole pieces having mutually different polarities on the outer peripheral surface of the cylindrical magnet body. A lifting device, wherein a magnetic body and a non-magnetic body are alternately arranged in the width direction of the pole piece. 2. A hoisting device comprising a plurality of slits in the width direction of the pole piece.