JPH02305797A - Lifting magnet - Google Patents

Abstract

PURPOSE:To carry out the attraction and release of a work easily, and moreover, to keep a permanent magnet in the condition receiving no shock, by rotating a converting body so that the first or the second movable yoke short-circuits magnetically between the first and the second fixed yokes. CONSTITUTION:At first, a converting body 23 is rotated. In such a condition, the first movable yoke 31 short-circuits magnetically between the first and the second fixed yokes 21 and 22. As a result, no leakage of the poor magnetic flux is generated out of a permanent magnet 20, and attraction pieces 7 are in the nonmagnetized condition. In such a condition, a lifting magnet is lowered until its attraction members 8 are contacted to a work W. After that, by rotating about 60 deg. the converting body 23, the first and the second movable yokes 31 and 32 connect magnetically the first and the second attraction bodies B and C, and the first and the second fixed yokes 21 and 22 respectively through a main pole 15, the magnetic route of the magnetic flux from the permanent magnet 20 is converted, the attraction pieces 7 are magnetized respectively, and the work W is attracted to the attraction members 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lifting magnet used for lifting or transporting a workpiece by attracting it by magnetic force.

[Conventional technology]

This type of lifting magnet generally uses an electromagnet to magnetize an adsorbing body for adsorbing a workpiece to adsorb the workpiece. However, this type of device requires a power supply to the electromagnet when it attracts a workpiece, and there is a problem in that it can only be used in places where such a power source can be obtained. . In order to solve these problems, the above-mentioned attracting body is magnetized by a permanent magnet, and the permanent magnet has a rotatable structure to magnetize the above-mentioned attracting body or to demagnetize the magnetization. There are attempts to make it possible.

[Problem to be solved by the invention]

However, with such a structure, the permanent magnet must be moved each time a workpiece is attracted or released, and when such an operation is performed, a shock is applied to the permanent magnet, and a part of it may be damaged. There was a problem in that accidents occurred where the parts were chipped and became unusable.

The present invention has been made in view of the above points, and its purpose is to make it possible to attract a workpiece by the magnetic force of a permanent magnet, and to easily attract and release the workpiece by rotating the switching body. To provide a lifting magnet capable of preventing permanent magnets from being damaged by keeping the permanent magnets in a state where no impact is applied even when the permanent magnets are capable of carrying out such operations.

[Means to solve problems]

In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows.

[Effect]

When attracting a workpiece, the magnetic flux of the permanent magnet reaches the first attracting body through the first fixed yoke and the first movable yoke, and also reaches the second attracting body through the second fixed yoke and the second movable yoke. Then, each adsorbent is magnetized. The workpiece is attracted by these magnetized adsorbents. When releasing the workpiece, the switching body is rotated so that the first or second movable yoke magnetically shorts between the first and second fixed yokes. As a result, the magnetization of the first and second attracting bodies is released, and the workpiece is released.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

In FIGS. 1 to 4, A indicates the base frame, B and C indicate the first and second adsorbents respectively attached to the base frame A, and D indicates the magnetizing means attached to the base frame A; This is for magnetizing the adsorbents B and C.

First, the base frame A will be explained. Reference numeral 1 indicates a support column, and reference numeral 2 indicates a guide member, both of which are made of non-magnetic material. As shown in FIG. 3, these are respectively disposed on both sides of the magnetizing means and are fastened together with fasteners 3. Although a port 3a and a nut 3b are used as fasteners, other means may also be used. 4 is a connecting part provided on the support 1, which is a part that connects to the moving part of the conveying device. , a through hole 5 for connection is provided.

Next, the first and second adsorbents B and C will be explained. Each of the adsorption bodies B and C is composed of a plurality of adsorption pieces 7, respectively. Each attraction piece 7 is made of a magnetic material and is placed inside the guide member 2 so as to be vertically movable. Reference numeral 8 denotes a suction section constituted by the lower end of each suction piece, and numeral 9 denotes a stopper attached to the upper end of the suction piece, for regulating the lowering position of the suction piece 7. Reference numeral 11 denotes a retaining member attached to the middle part of the suction piece, and is used to prevent the suction piece from coming off upward in FIG. 2.

Next, the magnetization means will be explained. 14 is a housing having two elements 14a and 14 each made of a non-magnetic material.
b are arranged to face each other. Reference numerals 15 and 16 indicate main poles attached to each element 14a, 14b, both of which are made of a magnetic material, and each of which has an attraction surface 15a, 16a. Reference numeral 17 denotes an auxiliary cork, which is made of a magnetic material and is fixed to the housing 14 by screw screw means (other means may also be used). Reference numerals 17a and 17b indicate suction surfaces of the auxiliary yoke.

Next, 18 shows a magnet assembly attached to the housing 14. To explain this assembly 18, 20 is a permanent magnet, which is plate-shaped, and the right side and left side in FIG. 2 are magnetic poles. It has become. As this permanent magnet, any well-known magnet such as a rare earth magnet or a ferrite magnet can be used. Reference numerals 21 and 22 indicate first and second fixed yokes made of a magnetic material, respectively, and are arranged to sandwich the permanent magnet 20 from both magnetic pole sides thereof.

The housing 14, main poles 15, 16, and magnet assembly 1B are assembled as follows. That is, element 14a
First, the main pole 15 and the first fixed yoke 21 are integrated by brazing or bonding means using an adhesive, and the outer peripheral surface of the integrated product is cut.

Further, the main pole 16 and the second fixed yoke 22 are assembled to the element 14b by the same means. After that, they are joined together with the permanent magnet 20 positioned between the first fixed cork 21 and the second fixed yoke 22, and then tightened together with the fastener 3 on the base frame. This is done by making the

Next, reference numeral 23 denotes a switching body in the magnetizing means, which is formed in the shape of a round bar as shown in the figure, and is rotatably placed in the storage space 24 provided in the housing 14, and a cover body 25, 26 for preventing removal. This prevents it from coming out of the space 24. The switching body 23 will be explained below. Reference numeral 27 denotes a base material made of a non-magnetic material.

Reference numerals 31 and 32 are first members made of magnetic material fixed to the base material 27, respectively.
and a second movable yoke, these movable yokes 31
．． 32 is a length in the circumferential direction shown in FIG. 5, L h, so that the length that can perform the action described below is such that the square length of the movable yoke 31 or 32 is about 120 mm with respect to the rotation center of the switching body 23. It is formed into a fan shape.

The assembly of the movable yokes 31 and 32 to the base material 27 is as follows:
A 7-shaped recess 28, 29 is formed in the base material 27, and a movable yoke 31, 32 having a fan-shaped cross section is fixed therein by brazing or using a well-known bonding method using an adhesive, and then the outer shape becomes a round bar shape. This is done by cutting their outer peripheral surfaces so that Reference numeral 33 denotes an operating shaft integrally formed with the base member 27, which protrudes to the outside through a through hole provided in the lid body 25, and an operating handle 34 is attached thereto.

Among the materials constituting each of the above-mentioned members, for example, soft iron is used as the magnetic material, and non-magnetic stainless steel, brass, aluminum, hard plastic, etc. are used as the non-magnetic material.

Next, the operation of attracting and releasing a workpiece by the lifting magnet having the above configuration will be explained.

First, the switching body 23 is rotated to the position shown in FIG. 6(B). In this state, the first movable yoke 31 magnetically shorts between the first and second fixed corks 21 and 22. (It may be rotated so that it is short-circuited by the second movable yoke 32.) Then, the magnetic flux from the permanent magnet 20 follows a magnetic path as shown by the broken line in the figure, and the defective magnetic flux leaks to the outside. There is no magnet, and the attraction piece 7 is in a non-magnetized state. In this state, the lifting magnet is lowered toward the workpiece W until the suction portion 8 of each suction piece 7 comes into contact with the workpiece W. In this case, the first and second adsorbents B
, C can be moved up and down independently of each other, and in addition, in each of the adsorption bodies B and C, a large number of adsorption pieces 7 can be moved up and down independently, so the upper surface of the workpiece W has an uneven shape. However, each suction portion 8 of each suction piece 7 can come into contact with the upper surface of the workpiece W.

When the above state is reached, operate the handle 34 to rotate the switching body 23 by about 60° to the position shown in FIG. 6(A). In this state, since the first and second movable yokes 31 and 32 are formed in the shape described above, the first movable yoke 31 is connected to the first suction via the main pole 15, as shown in the figure. The body B and the first fixed yoke 21 are magnetically connected, and the second movable yoke 32 magnetically connects the second adsorbent C and the second fixed yoke 22 via the main pole 16. Therefore, the magnetic path of the magnetic flux from the permanent magnet 20 is switched as shown by the broken line in the figure, and each attracting piece 7 is magnetized, and the work W is attracted to its attracting portion 8. By passing the magnetic flux as described above, each attracting piece 7 in attracting bodies B and C
are attracted to the attraction surfaces 15a, 17a or 16a, 17b, respectively, and their vertical movement is prevented.

When such a state is reached, the lifting magnet is moved to the target position for transporting the workpiece by the transport device. Then, at that location, the handle 34 is operated to rotate the switching body 23 to the state shown in FIG. 6(B). In this state, the magnetic path becomes as shown in FIG. 6(B) again, the magnetization of the attracting piece 7 is released, and the workpiece W is released. In this case, since the magnetic circuit is open between the main poles 15 and 16, there is no residual v11 magnetism of the attraction piece 7, and the workpiece W is released smoothly.

In the Shofuki switching body 23, the angle of the movable yoke 31 or 32 with respect to its center of rotation may be any angle other than 120' as long as the magnetic path can be switched as described above. It may be provided only on the circumferential surface of the switching body, or may be provided with only the portion facing the main pole or fixed yoke exposed on the rtJ surface, and the rest embedded within the switching body.

(Effects of the Invention) As described above, in the present invention, when collecting workpieces W, the workpieces W are attracted by the magnetic force of the permanent magnet 20, so there is no need to supply power as in the case of conventional electromagnets. This provides the convenience of being able to perform suction work anywhere.

Moreover, even with permanent magnets, if you want to release the attracted workpiece W or to attract another workpiece again, you can easily release and attract the workpiece by simply rotating the switching body 23. It has the effect of doing this.

Furthermore, even if a permanent magnet is used and the attraction and release are performed by a mechanical rotation operation, when the operation is repeated, switching is performed by rotating the movable yokes 31 and 32, which are spaced apart from the permanent magnet 20. This is done by holding the permanent magnet 20 in place so that no impact is applied to the permanent magnet 20, and since both sides of the permanent magnet 20 are protected by fixed yokes 21 and 22, the permanent magnet 20 is free from defects such as ferrite. Even if it is made of a fragile material, it can be prevented from breaking and its life can be extended.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway front view, FIG. 2 is a sectional view taken along the line ■-■, and FIG. 3 is a m-m 1
4 is an exploded perspective view, FIG. 5 is a perspective view of the switching body, and FIGS. 6(A) and 6(B) are operation explanatory views. B...first adsorbent, C...second adsorbent, D...
- Magnetizing means, 18... Magnet assembly, 2°... Permanent magnet, 21... First fixed yoke, 22... Second
fixed yoke, 23... switching body, 31... first movable yoke, 32... second movable yoke. Figure 1 Figure 2 Figure I3

Claims (1)

[Claims] first and second suction bodies each having a workpiece suction part;
A lifting magnet comprising a magnetizing means for magnetizing the first and second attracting bodies, wherein the magnetizing means includes a permanent magnet and first and second fixed yokes respectively attached to both magnetic poles of the permanent magnet. a magnet assembly having;
a switching body which is provided with a first movable yoke and a second movable yoke and is freely rotatable, and the lengths of the first and second movable yokes in the switching body are such that When magnetically connecting the first adsorbent and the first fixed yoke, the second movable yoke has a length that magnetically connects the second adsorbent and the second fixed yoke, Further, by rotating the switching body, either the first or second movable yoke has a length that magnetically shorts between the first and second fixed yokes. Lifting magnet.