Curved surface adsorption device

Abstract

To provide a curved surface attraction device that is able not only to obtain, with a simple structure, attraction force sufficient for a curved surface of an attraction target body, but also to be detached from the curved surface of the attraction target body with simple operation.SOLUTION: Rare-earth magnets 7a and 7b are unevenly distributed locally in a device main body so that densities of magnetic fluxes generated from a pair of magnetic members 4a and 4b gradually vary in a longitudinal direction. In the device main body, curved surfaces of the pair of magnetic members 4a and 4b respectively line-contact the curved surface of an attraction target body, so that a magnetic circuit passing through the attraction target body is formed to attract the attraction target body.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a curved surface attracting device capable of attracting a device body to a curved surface of an attractable object which is a magnetic material. [Background technology]

[0002] 2. Description of the Related Art When transporting curved workpieces such as metal cylindrical pipes or metal columnar materials in factories, construction sites, etc., or when aligning metal pipes for connection, attempts have been made to attach an operating member having a magnet to the workpiece and operate it in order to enable workers to handle the workpiece safely.

[0003] Generally, plate-shaped solid magnets such as ferrite magnets are poor in flexibility and tend to create air gaps between the magnet's attraction surface and the curved surface of the object to be attracted, making it difficult to obtain sufficient adhesion. Even if the plate-shaped magnet is made into a V-shape and attracted at multiple points, the adhesion force is insufficient. In contrast, plate-shaped solid magnets using rare earth magnets have such strong adhesion that once they are attracted to an object, they are difficult to remove. It is particularly difficult to remove when flat surfaces are attracted to each other.

[0004] In order to improve the detachment from the object to be attracted, it is also possible to use an electromagnet instead of a permanent magnet as the magnetic flux source. However, this requires a switch to turn the current on and off, which increases the number of parts, and in addition, when used outdoors, it is necessary to ensure waterproofing, which increases manufacturing costs and makes it difficult to use.

[0005] Although not an operating component used at a work site, the following has been proposed as a technique for adsorbing and fixing a workpiece to a curved metallic support. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 55-23763 [Patent Document 2] Patent No. 4378668 Summary of the Invention [Problem to be solved by the invention]

[0007] However, with the configuration of Patent Document 1 mentioned above, an air gap is likely to occur between the attracting surface of the plate-like magnet and the curved surface of the object to be attracted, and a sufficient attracting force cannot be obtained with the ferrite magnet. In the configuration of Patent Document 2, the end face of the yoke that faces the attracting surface of the object to be attracted needs to be processed according to the curvature of the curved surface, which increases the number of steps and increases the manufacturing cost. Although a sufficient attracting force is obtained for the curved surface because a rare earth magnet is used, it is not easy to remove the yoke from the curved surface once it has been attracted by the worker alone. [Means for solving the problem]

[0008] The present invention has been made to solve these problems, and its object is to provide a curved surface adsorption device that has a simple configuration and is capable of obtaining sufficient adsorption force on the curved surface of an object to be adsorbed, while also being able to peel off from the curved surface of the object to be adsorbed with simple operation.

[0009] In order to achieve the above object, the present invention provides a magnetic adsorption device having the following configuration. A curved surface attraction device capable of attracting a device body to a curved surface of an object to be attracted, the device body comprising: a rare earth magnet that is disposed on the device body and generates a magnetic flux that forms a magnetic circuit between the device body and the object to be attracted; North or South pole Consists of magnetic poles and magnetic material The magnetic pole member is a protrusion. A pair of adjacent contact surfaces are arranged parallel to each other, at least the contact surfaces with the object to be attracted are formed into curved surfaces. The above and magnetic pole members, the rare earth magnets being unevenly distributed in a portion of the device body so that the magnetic flux density generated from the pair of magnetic pole members gradually changes in the longitudinal direction, and the device body is attracted by the curved surfaces of the pair of magnetic pole members each making line contact with the curved surface of the object to be attracted, thereby forming a magnetic circuit that passes through the object to be attracted. According to the above-mentioned configuration, the curved surfaces of the pair of magnetic pole members and the object to be attracted are in line contact with each other, forming a magnetic circuit in which the magnetic flux generated by the rare earth magnet passes through the object to be attracted. Therefore, with this simple configuration, the operator can attract the device body by simply bringing the curved surfaces of the pair of magnetic pole members toward the object to be attracted and, because rare earth magnets are used, the line contact between the curved surfaces alone is sufficient to maintain the attracted state. In addition, since the magnetic flux density generated from the pair of magnetic pole members gradually changes in the longitudinal direction, it is easy to displace the device main body by utilizing a portion of the pair of magnetic pole members which has a relatively low magnetic flux density in the longitudinal direction, and the attachment state between the device main body and the object to be attached can be changed from a line contact state between the curved surfaces to a point contact state, thereby easily separating the object from the object.

[0010] The adhesive state between the pair of magnetic pole members and the object to be attracted may be released by rotating the device body around the axis of the portion of the pair of magnetic pole members in the longitudinal direction where the magnetic flux density is highest and adjacent to the rare earth magnet. In this way, by rotating the device body around the axis at the portion of high magnetic flux density where a pair of magnetic pole members are adjacent to the rare earth magnet, the curved surfaces change from a line contact state to a point contact state, increasing the magnetic resistance, and the device body can be easily detached from the object to be attracted.

[0011] The device body may be provided with a handle that is gripped by an operator. The handle may extend in a direction away from the rare earth magnet disposed in the device body. This allows the operator to grasp the handle and move the device body, improving workability and operability. In particular, the handle on the extension side away from the rare earth magnet can be held while rotating the device, making it easy to operate, and the device body can be rotated around the axis of the part with high magnetic flux density with little rotational force to peel it off.

[0012] The magnetic pole members may be arranged in parallel with each other, with their curved surfaces facing outward, on a pair of rare earth magnets that are stacked and biased toward one longitudinal end of the magnetic material, which is the magnetic material that constitutes the device main body. As a result, the curved surfaces of the pair of magnetic pole members are each brought into line contact with the curved surface of the object to be attracted, and by rotating the other longitudinal end of the pair of magnetic pole members around an axis at which the magnetic flux density is high, the curved surfaces change from a line contact state to a point contact state, making it easy to detach the device main body from the object to be attracted.

[0013] The magnetic body may be a magnetic material, and the pair of rare earth magnets may be arranged overlapping each other in the longitudinal center of the magnetic material. The pair of magnetic pole members may be arranged in parallel with the curved surfaces facing outward. As a result, the curved surfaces of the pair of magnetic pole members are each brought into line contact with the curved surface of the object to be attracted and held, and by rotating one or the other longitudinal end of the pair of magnetic pole members around the axis at the longitudinal center portion where the magnetic flux density is high, the curved surfaces change from a line contact state to a point contact state, making it easy to detach the device main body from the object to be attracted.

[0014] The device body may be made of a non-magnetic material, and a rare earth permanent magnet may be arranged biased toward one longitudinal end of the non-magnetic material, and a pair of magnetic pole members may be arranged in parallel with the curved surfaces facing outward, sandwiching the rare earth magnet. As a result, the curved surfaces of the pair of magnetic pole members are each brought into line contact with the curved surface of the object to be attracted, and by rotating the other longitudinal end of the pair of magnetic pole members around an axis at which the magnetic flux density is high, the curved surfaces change from a line contact state to a point contact state, making it easy to detach the device main body from the object to be attracted. Effect of the Invention

[0015] It is possible to provide a curved surface adsorption device that can obtain sufficient adsorption force on the curved surface of an object to be adsorbed with a simple configuration, while also being capable of peeling off from the curved surface of the object to be adsorbed with a simple operation. [Brief description of the drawings]

[0016] [Figure 1] 1A is a front view, a plan view, a left side view, and a bottom view of a curved surface suction device. FIG. [Diagram 2]2 is a perspective view showing a state in which the curved surface suction device of FIG. 1 is suctioned onto a cylindrical tube. FIG. [Diagram 3] 4 is an explanatory diagram showing a procedure for removing the curved surface suction device of FIG. 1 from a cylindrical tube. [Figure 4] 1A is a front view, a plan view, and a left side view of a curved surface suction device of a first embodiment. [Diagram 5] FIG. 5 is an exploded perspective view of the curved surface suction device of FIG. 4. [Figure 6] 5A is a front view, a plan view, and a left side view showing a modified example of the curved surface suction device of FIG. 4. [Figure 7] 5A is a front view, a plan view, and a left side view showing a modified example of the curved surface suction device of FIG. 4. [Figure 8] 5A is a front view, a plan view, and a left side view showing a modified example of the curved surface suction device of FIG. 4. [Figure 9] 9 is an explanatory diagram showing a procedure for removing the curved surface suction device of FIG. 8 from a cylindrical tube. [Figure 10] 11 is a front view, a plan view, a left side view, and a bottom view of a curved surface suction device of Example 2. [Figure 11] FIG. 11 is an exploded perspective view of the curved surface suction device of FIG. 10. [Figure 12] 11 is a front view, a plan view, a left side view, and a bottom view of a curved surface suction device of Example 3. [Figure 13] FIG. 13 is an exploded perspective view of the curved surface suction device of FIG. 12. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [Example 1] A schematic configuration of the curved surface adsorption device according to the first embodiment will be described below with reference to Fig. 1 to Fig. 9. The curved surface adsorption device 1 is a tool that enables, for example, a worker at a factory or construction site to carry out a transport or alignment operation while adsorbing the device body to a curved surface of an adsorbed object (such as a metal cylinder or metal columnar object) that is a magnetic material, and to easily detach the device from the adsorbed object with a simple operation.

[0018] 1(A) to 1(C), the curved surface attraction device 1 has a ring-shaped handle 3 provided on the top surface of the device body covered with a cover 2, and a pair of magnetic pole members 4a, 4b made of a magnetic material protruding from the bottom surface side of the device body. As will be described later, the pair of magnetic pole members 4a, 4b are adapted to come into contact with and attract the curved surface of an object to be attracted 5 (see FIG. 1(C)).

[0019] In Fig. 4(A)-(D), the curved surface adsorption device 1 is provided with a rectangular magnetic plate material constituting a base plate 6 which is the main body of the device. The magnetic plate material is, for example, iron, iron alloy, SUS (stainless steel), etc. In the following embodiment, the base plate 6 is referred to as a magnetic plate material, but a magnetic block material with a thicker plate may be used. As shown in Fig. 4(C), the rare earth magnets 7a, 7b are disposed between the base plate 6 and a pair of magnetic pole members 4a, 4b, and generate a magnetic flux that forms a magnetic circuit. As the rare earth magnets 7a, 7b, for example, neodymium magnets, samarium cobalt magnets, etc. are preferably used. As shown in Fig. 4(A), (B), and (D), the pair of rare earth magnets 7a, 7b are disposed facing each other, biased toward one end side of the longitudinal direction of the base plate 6. The magnetization direction of each rare earth magnet 7a, 7b is such that the N pole or S pole is adjacent to the magnetic pole members 4a, 4b described later, respectively, and the S pole or N pole is adjacent to the base plate 6, respectively. As a result, a magnetic path is formed that connects rare earth magnet 7a → base plate 6 → rare earth magnet 7b → magnetic pole member 4b → magnetic pole member 4a, as shown by the two-dot chain line arrow P in Fig. 4(C). Note that the magnetization directions of rare earth magnets 7a, 7b may be opposite, in which case the magnetic path will be in the opposite direction to that of arrow P in Fig. 4(C).

[0020] As shown in Figures 4(A) and (C), the pair of magnetic pole members 4a and 4b are made of a magnetic material, and at least the contact surface with the object 5 is formed as a curved surface as shown in Figure 1(C). Specifically, the pair of magnetic pole members 4a and 4b are semi-cylindrical protrusions provided along the longitudinal direction of the base plate 6. Article They are arranged parallel to each other. Article andFor example, iron, iron alloy, SUS, etc. are used. When the contact surfaces of the pair of magnetic pole members 4a, 4b are configured only as semi-cylindrical curved surfaces as in this embodiment, as shown by the solid line in Fig. 3(A), when the device body is attached to the attached object 5, the pair of magnetic pole members 4a, 4b are in line contact along the generatrix direction of the curved surfaces, but when the device body is displaced by 90 degrees as shown in Fig. 3(B), the curved surfaces are in point contact with each other, which is an advantage in that it is extremely easy to remove. In this embodiment, the pair of magnetic pole members 4a, 4b are adjacent to the rare earth magnets 7a, 7b at one end side in the longitudinal direction (right end in Fig. 4(A)), and at the other end side in the longitudinal direction (left end in Fig. 4(A)), gaps 8a, 8b are formed between the pair of magnetic pole members 4a, 4b and the base plate 6 (see Fig. 4(A)(D)).

[0021] As shown in FIG. 4(C), the pair of magnetic pole members 4a, 4b are formed to have the same protruding height from the cover 2, but the height may be changed to match the curved shape of the object to be attracted 5 (see FIG. 1(c)). In this embodiment, the pair of magnetic pole members 4a and 4b are semi-cylindrical protrusions. Article Although the above is an example, other shapes, such as a kamaboko-shaped protrusion In Article By including a curved surface in the contact surface with the attracted object 5 in this way, the curved surface attracting device 1 can be applied to round bars, angle steel materials, and the like other than flat plates, expanding the range of use and suppressing magnetic loss due to deformation and wear of the corners. In addition, the contact surfaces of the pair of magnetic pole members 4a and 4b do not necessarily have to be curved surfaces only, as long as they are partially curved so as to be in line contact with the curved surface of the object to be attracted 5. Article Furthermore, it is preferable that both end portions 4c of the pair of magnetic pole members 4a, 4b are each formed in a curved shape so as to avoid the formation of edges where magnetic flux is likely to concentrate.

[0022] As shown in Fig. 4(A), the handle 3 is provided on the upper surface of the cover 2 that covers the base plate 6. That is, the handle 3 is provided on the side opposite to the attracting side on which the pair of magnetic pole members 4a, 4b are provided with respect to the base plate 6. As shown in Fig. 5, both ends of the handle 3 are fixed to the base plate 6 by set screws 9a, 9b, and the middle part is formed into a ring shape that can be gripped by an operator. The cover 2 is made of a non-magnetic material (such as aluminum or non-magnetic stainless steel) and covers the curved surface attraction device 1 except for the attraction surface where the pair of magnetic pole members 4a, 4b are exposed. The cover 2 is used to improve waterproofing and durability by covering the rare earth magnets 7a, 7b. The presence of the cover 2 can also prevent inadvertent attraction caused by magnetic flux leaking from the end faces of the rare earth magnets 7a, 7b. The cover 2 may be preformed, or may be provided by insert molding together with the base plate 6.

[0023] The rare earth magnets 7a, 7b are located in a portion of the base plate 6 so that the magnetic flux density generated from the pair of magnetic pole members 4a, 4b gradually changes in the longitudinal direction. Specifically, in Fig. 4(B), the pair of rare earth magnets 7a, 7b are located in a stacked manner on the right end of the base plate 6 in the longitudinal direction, and the pair of magnetic pole members 4a, 4b are located in parallel with each other with their curved surfaces facing outward. At the left end of the pair of magnetic pole members 4a, 4b where the rare earth magnets 7a, 7b are not provided, gaps 8a, 8b are formed between the base plate 6 and the pair of magnetic pole members 4a, 4b (see Figs. 4(A)(D)).

[0024] An example of assembly of the curved surface adsorption device 1 will be described with reference to FIG. 5. Six set screws 10a, 10b, 10c, 10d, 10e, and 10f (sleeve bolts) are used to screw the base plate 6 to the magnetic pole member 4a. The set screws 10a and 10b are used to screw the magnetic pole member 4a to the base plate 6 at one end in the longitudinal direction by overlapping the rare earth magnet 7a and the magnetic pole member 4a on the base plate 6 in this order, penetrating the base plate 6 and the rare earth magnet 7a. The set screw 10c is used to screw the magnetic pole member 4a to the other end in the longitudinal direction through the gap 8a. The set screws 10d and 10e are used to screw the magnetic pole member 4b to the base plate 6 at one end in the longitudinal direction by overlapping the rare earth magnet 7b and the magnetic pole member 4b on the base plate 6 in this order, penetrating the base plate 6 and the rare earth magnet 7b. Furthermore, the set screw 10f penetrates the base plate 6 and screws the magnetic pole member 4b through the gap 8b at the other end in the longitudinal direction. These are housed in the cover 2, the handle portion 3 is placed on the cover 2, and the set screws 9a, 9b are screwed to the handle portion 3 and the base plate 6, respectively, to be assembled together. In the above embodiment, the components of the device are fixed by screws, but the components may be fixed only by adhesive, or may be fixed by both screws and adhesive. Components other than the rare earth magnet may be fixed by welding.

[0025] Due to the uneven distribution of the rare earth magnets 7a, 7b with respect to the base plate 6, as shown in Fig. 4(A), the magnetic flux density generated from the pair of magnetic pole members 4a, 4b is highest at the right end in the longitudinal direction and gradually decreases toward the left end in the longitudinal direction. When the pair of magnetic pole members 4a, 4b each come into line contact with the curved surface of the attracted object 5, a magnetic circuit is formed that passes from the pair of magnetic pole members 4a, 4b through the attracted object, thereby attracting it. That is, as shown by the arrow P in Fig. 4(C), a magnetic circuit is formed that passes through the rare earth magnet 7a → base plate 6 → rare earth magnet 7b → magnetic pole member 4b → attracted object 5 (see Fig. 1(C)) → magnetic pole member 4a and returns to the rare earth magnet 7a. As shown in Figure 2, a pair of magnetic pole members 4a, 4b are each in line contact along the generatrix direction with the cylindrical surface (curved surface) of the cylindrical tube, which is the object to be attracted 5, thereby forming a magnetic circuit in which the magnetic flux generated by the rare earth magnets 7a, 7b passes through the object to be attracted 7, so that the curved surface attracting device 1 can be attracted to the object to be attracted 5 having a curved surface with sufficient attracting force.

[0026] Next, an example of a procedure for releasing the curved surface attraction device 1 attracted to the object 5 shown in FIG. 2 will be described with reference to FIGS. 3(A)-(C). As shown in FIG. 2, in the curved surface attraction device 1, the pair of magnetic pole members 4a, 4b are attracted by line contact so that their longitudinal direction is along the generatrix direction of the cylindrical tube which is the object 5 to be attracted. As shown in FIG. 3(A), the lower end side of the handle part 3, which has a lower magnetic flux density and is farther away from the rare earth magnets 7a, 7b, is grasped around the upper end side (see FIG. 4(A)) of the handle part 3, which has the highest magnetic flux density in the longitudinal direction of the pair of magnetic pole members 4a, 4b, as an axis, and the device body is rotated, for example, 90 degrees in the direction of the arrow (counterclockwise direction). As a result, as shown in FIG. 3(B), the curved surfaces of the pair of magnetic pole members 4a, 4b and the object 5 to be attracted are displaced from the state of line contact to the state of point contact. In this way, the curved surfaces of the pair of magnetic pole members 4a, 4b and the object to be attracted 5 change from line contact to point contact, increasing the magnetic resistance and weakening the attraction force. Next, as shown in Fig. 3(C), when the left longitudinal end side of the handle part 3 is pulled outward, the right longitudinal end side of the pair of magnetic pole members 4a, 4b, which has the lowest magnetic flux density in the longitudinal direction, remains last, and the curved surface attraction device 1 can be easily detached from the object to be attracted 5.

[0027] In this simple device configuration, the operator can adhere the object to be adhered by simply holding the handle portion 3 and bringing the pair of magnetic pole members 4a, 4b into line contact with the object to be adhered 5, and because rare earth magnets 7a, 7b are used, the adsorption state of the curved surface adsorption device 1 can be maintained with sufficient adsorption force even when the curved surfaces are only in line contact with each other. In addition, since the magnetic flux density generated from the pair of magnetic pole members 4a, 4b gradually changes in the longitudinal direction of the base plate 6, it is easy to displace the main body of the device by utilizing a portion of the pair of magnetic pole members 4a, 4b having a relatively low magnetic flux density, and the adsorption state between the curved surface adsorption device 1 and the object to be adsorbed 5 can be changed from a line contact state between the curved surfaces to a point contact state, thereby easily separating the object from the curved surfaces.

[0028] The handle portion 3 is not limited to being assembled within the projected area of ​​the curved surface adsorption device 1, but may be assembled so as to protrude (overhang) beyond the projected area of ​​the device body as shown in Figs. 6 to 8. The internal configuration of the curved surface adsorption device 1 is the same as that of the first embodiment. Figs. 6(A) to 6(C) show an embodiment in which the handle portion 3 is extended on both sides of the base plate 6 in the longitudinal direction. The handle portion 3 is fixed to the base portion 3a, which is longer than the base plate 6, by means of set screws 9a and 9b at the annular portion 3b. When the handle portion 3 is extended on both sides of the base plate 6 in the longitudinal direction, the length of the annular portion 3b that the operator grasps is increased, improving operability, and in addition, when displacing the device body, the curved surface adsorption device 1 can be rotated with little rotational force around the portion of the pair of magnetic pole members 4a and 4b where the magnetic flux density is high, while grasping the annular portion 3b on the extended side farther from the rare earth magnets 7a and 7b, due to the principle of leverage. The handle portion 3 may be fixed to the base plate 6 by screws, adhesive, welding, or a combination of these.

[0029] 7(A) to (C) show another example in which the handle part 3 is assembled so as to extend beyond the projected area of ​​the device main body. The handle part 3 has a base part 3a that is longer than the base plate 6, and an annular part 3b is fixed to the base part 3a by set screws 9a and 9b. In this case, the handle part 3 including the base part 3a and the annular part 3b is extended outward from the base plate 6 at the other longitudinal end side (left end side) opposite to the pair of rare earth magnets 7a, 7b provided overlapping each other at one longitudinal end side (right end side) of the base plate 6. In this way, when the handle portion 3 is extended to the other end side in the longitudinal direction of the base plate 6, the length of the annular portion 3b that the operator grasps becomes longer, improving operability, and when displacing the device body, the operator can rotate the curved surface adsorption device 1 with little rotational force around the part of the pair of magnetic pole members 4a, 4b where the magnetic flux density is high, by using the principle of leverage, while grasping the annular portion 3b on the extended side away from the rare earth magnets 7a, 7b. The handle portion 3 may be fixed to the base plate 6 by screws, adhesives, welding, or a combination of these.

[0030] 8(A) to (C) show another example in which the handle part 3 is assembled so as to extend beyond the projected area of ​​the device main body. The handle part 3 has a similar configuration in which the annular part 3b is fixed to the base part 3a, which is longer than the base plate 6, by set screws 9a and 9b. In this case, the handle part 3 including the base part 3a and the annular part 3b is extended outward from the base plate 6 at one longitudinal end side (right end side) where the pair of rare earth magnets 7a and 7b are stacked on the base plate 6.

[0031] 9(A)-(C) show an example of a procedure for releasing the curved surface attraction device 1 shown in FIG. 8 that has been attracted to the object 5. As shown in FIG. 9(A), the curved surface attraction device 1 is attracted by line contact so that the longitudinal direction of the pair of magnetic pole members 4a, 4b is aligned with the generatrix direction of the cylindrical tube that is the object 5. The handle 3 extending outward from the base plate 6 is held and the device body is rotated, for example, 90 degrees in the direction of the arrow (counterclockwise direction) around the lower end side where the magnetic flux density is highest in the longitudinal direction of the pair of magnetic pole members 4a, 4b. As a result, the curved surfaces of the pair of magnetic pole members 4a, 4b and the object 5 are displaced from a line contact state to a point contact state as shown in FIG. 9(B). In this way, the curved surfaces of the pair of magnetic pole members 4a, 4b and the object 5 are changed from line contact to point contact, and the magnetic resistance increases and the attraction force weakens. Next, as shown in Figure 9 (C), when the handle portion 3 overhanging from the base plate 6 is pulled outward, the left end side in the longitudinal direction of the pair of magnetic pole members 4a, 4b, which has the lowest magnetic flux density in the longitudinal direction, remains last, and the curved surface adsorption device 1 can be easily detached from the adsorbed object 5.

[0032] In this way, even if the handle portion 3 is extended outward from one longitudinal end side of the base plate 6 on which the rare earth magnets 7a, 7b are arranged, by grasping and operating the extended handle portion 3, it is possible to rotate the curved surface adsorption device 1 with little rotational force around the axis at the part of the pair of magnetic pole members 4a, 4b where the magnetic flux density is high, using the principle of leverage.

[0033] In either case, the curved surface adsorption device 1 can be rotated with little rotational force around the axis at the part of the pair of magnetic pole members 4a, 4b where the magnetic flux density is high while grasping the handle portion 3 on the extended side away from the rare earth magnets 7a, 7b, thereby enabling the material to be detached from the adsorption surface of the adsorbed object 5, thereby improving operability. The handle 3 is not limited to a ring shape, and may be of other shapes, such as an L-shape or T-shape that connects to the base plate 6. If an operator can directly grip the base plate 6 to operate it, the external handle 3 may be omitted.

[0034] [Example 2] Another example of the curved surface suction device 1 will be described below. The same members as those in the first embodiment are given the same reference numbers and the description will be repeated. The following description will focus on different configurations. As shown in Figures 10(A), (B), and (D), a pair of rare earth magnets 7a, 7b are arranged adjacent to each other in the longitudinal center of the base plate 6. Specifically, in Figure 10(A), the rare earth magnets 7a, 7b are arranged overlapping each other in the longitudinal center of the pair of parallel-arranged magnetic pole members 4a, 4b. Gaps 8a, 8b are respectively formed between the base plate 6 and both side portions of the pair of magnetic pole members 4a, 4b where the rare earth magnets 7a, 7b are not provided.

[0035] As shown in FIGS. 10(A) and 10(C), the pair of magnetic pole members 4a and 4b are semi-cylindrical protrusions provided along the longitudinal direction of the base plate 6. Article They are arranged parallel to each other. Article and For example, iron, iron alloy, SUS, etc. are used. In this embodiment, the pair of magnetic pole members 4a, 4b are overlapped with rare earth magnets 7a, 7b at the longitudinal center, and gaps 8a, 8b are formed between the pair of magnetic pole members 4a, 4b and the base plate 6 on both longitudinal sides (see Figures 10(A) and (D)).

[0036] As shown in Fig. 10(A), the magnetic flux density generated by the pair of magnetic pole members 4a, 4b is highest in the center of the longitudinal direction and gradually decreases toward the left and right ends due to the arrangement of the rare earth magnets 7a, 7b. As shown by the two-dot chain arrow P in Fig. 10(C), a magnetic path is formed that connects the rare earth magnet 7a → base plate 6 → rare earth magnet 7b → magnetic pole member 4b → attracted body 5 (see Fig. 1(C)) → magnetic pole member 4a. The magnetization directions of the rare earth magnets 7a, 7b may be reversed, in which case the magnetic path will be opposite to the arrow P in Fig. 10(C). As a result, the curved surface adsorption device 1 is adsorbed and held by bringing the curved surfaces of the pair of magnetic pole members 4a, 4b into line contact with the curved surface of the object to be adsorbed 5 (see Figure 2), and by grasping and rotating the handle portion 3 at one or the other longitudinal end side around the longitudinal center portion of the magnetic pole members 4a, 4b, where the magnetic flux density is high, the curved surfaces change from a line contact state to a point contact state, and the device body can be easily detached from the object to be adsorbed 5 (see Figure 3).

[0037] In FIG. 11, an example of assembly of the curved surface adsorption device 1 shown in FIG. 10 will be described. Eight set screws 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h (sleeve bolts) are used to screw the base plate 6 to the magnetic pole member 4a. The set screws 10b and 10c are used to screw the magnetic pole member 4a to the center of the longitudinal direction by overlapping the rare earth magnet 7a and the magnetic pole member 4a on the base plate 6 in this order, penetrating the base plate 6 and the rare earth magnet 7a. The set screws 10f and 10g are used to screw the magnetic pole member 4b to the center of the longitudinal direction by overlapping the rare earth magnet 7b and the magnetic pole member 4b on the base plate 6 in this order, penetrating the base plate 6 and the rare earth magnet 7b. The set screws 10a and 10d are used to screw the magnetic pole members 4a facing each other through the gap portion 8a, at both ends of the longitudinal direction. Set screws 10e and 10h penetrate base plate 6 and secure magnetic pole member 4b, which faces each other across gap 8b, at both longitudinal ends. These are housed in cover 2, handle portion 3 is placed on cover 2, and set screws 9a and 9b are screwed to handle portion 3 and base plate 6, respectively, to assemble them together. In the above embodiment, the components of the device are fixed by screws, but the components may be fixed only by adhesive, or may be fixed by both screws and adhesive. Components other than the rare earth magnet may be fixed by welding. Furthermore, as shown in Figs. 6 to 8, the handle portion 3 may be assembled so as to protrude outward (overhang) from the projected area of ​​the device main body.

[0038] [Example 3] Next, another example of the curved surface suction device 1 will be described. The same members as those in the first embodiment are given the same reference numbers and the description thereof will be repeated. The following description will focus on different configurations. As shown in FIG. 12(A), a rectangular non-magnetic plate is used as a base plate 6', which is the main body of the device. A rare earth permanent magnet 7a is located on one longitudinal end side (right end) of this base plate 6'. Specifically, in FIG. 12(B), a pair of magnetic pole members 4a, 4b are arranged in parallel along the longitudinal direction of the base plate 6' and are held overlapping each other. The pair of magnetic pole members 4a, 4b are formed into a semi-cylindrical shape and have curved tips. Article It is used. Article and The magnet may be made of a magnetic material such as iron, an iron alloy, or stainless steel. A rare earth magnet 7a is sandwiched between a pair of magnetic pole members 4a, 4b adjacent to the base plate 6' and overlapped on one longitudinal end of the base plate 6'. A gap 8a is formed on the other longitudinal end where the rare earth magnet 7a is not provided (see FIG. 12D).

[0039] Due to this arrangement of the rare earth magnet 7a, as shown in Fig. 12(A), the magnetic flux density generated from the pair of magnetic pole members 4a, 4b is highest at the right end in the longitudinal direction and gradually decreases toward the left end in the longitudinal direction. As shown by the two-dot chain line arrow P in Fig. 12(C), for example, a magnetic path is formed that connects the rare earth magnet 7a → magnetic pole member 4b → attracted object 5 (see Fig. 1(C)) → magnetic pole member 4a → rare earth magnet 7a. Note that the magnetization direction of the rare earth magnet 7a may be reversed, in which case the magnetic path will be opposite to the arrow P in Fig. 12(C). As a result, the curved surface adsorption device 1 is adsorbed and held by bringing the curved surfaces of the pair of magnetic pole members 4a, 4b into line contact with the curved surface of the object to be adsorbed 5 (see Figure 2), and by grasping and rotating the handle portion 3 on the left longitudinal end side around the longitudinal right end side, where the magnetic flux density of the magnetic pole members 4a, 4b is higher, the curved surfaces change from a line contact state to a point contact state, and the device body can be easily detached from the object to be adsorbed 5 (see Figure 3).

[0040] In FIG. 13, an example of assembly of the curved surface adsorption device 1 shown in FIG. 12 will be described. Six set screws 10a, 10b, 10c, 10d, 10e, and 10f are used on the base plate 6', and two set screws 10g and 10h are used to fix the rare earth magnet 7a between the magnetic pole members 4a and 4b. The set screws 10a to 10c are used to screw the magnetic pole member 4a onto the base plate 6'. The set screws 10d to 10f are used to screw the magnetic pole member 4b onto the base plate 6' so that they are arranged parallel to the magnetic pole member 4a. The set screws 10g and 10h penetrate the magnetic pole member 4b and the rare earth magnet 7a and screw the magnetic pole member 4a. As a result, the rare earth magnet 7a is screwed and fixed between the magnetic pole members 4a and 4b, biased toward one end (right end) in the longitudinal direction. These are housed in the cover 2, the handle portion 3 is placed on top of the cover 2, and the set screws 9a, 9b are fastened to the handle portion 3 and the base plate 6, respectively, to be assembled together. In the above embodiment, the assembly example is shown in which each part of the device is fixed by screws, but the parts may be fixed only by adhesive, or may be fixed by screws and adhesive in combination. The parts other than the rare earth magnet may be fixed by welding. Also, as shown in Figures 6 to 8, the handle part 3 may be assembled so as to protrude outward from the projected area of ​​the device body (in an overhanging state).

[0041] In the curved surface suction device 1 shown in the above-mentioned embodiments 1 to 3, the device body 2 is covered with the cover 6 except for the suction surface, but the entire surface including the suction surface may be covered with a molded resin. [Explanation of symbols]

[0042] 1 curved surface adsorption device 2 cup 3 hand 3a handle 3b ring 4a, 4b magnetic pole member 4c end 5 adsorbed body 6, 6' base plate 7a, 7b rare earth magnet 8a, 8b gap 9a, 9b, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h stop

Claims

1. A curved surface adsorption device capable of adsorbing a device body to a curved surface of an adsorbed object which is a magnetic material, a rare earth magnet that is disposed in the device body and generates a magnetic flux that forms a magnetic circuit between the magnet and the object to be attracted; a pair of magnetic pole members, each of which is a protrusion made of a magnetic material and an N pole or S pole of the rare earth magnet, are disposed adjacent to each other, at least the contact surface with the object to be attracted is formed into a curved surface, and the magnetic pole members are disposed parallel to each other; The rare earth magnet is unevenly distributed in a part of the device body so that the magnetic flux density generated from the pair of magnetic pole members gradually changes in the longitudinal direction, and the device body is a curved surface adsorption device in which the curved surfaces of the pair of magnetic pole members each make line contact with the curved surface of the object to be adsorbed, forming a magnetic circuit that passes through the object to be adsorbed.

2. The curved surface adsorption device as described in claim 1, wherein the adsorption state between the pair of magnetic pole members and the object to be adsorbed can be released by rotating the device body around the axis of the portion of the pair of magnetic pole members in the longitudinal direction where the magnetic flux density is highest adjacent to the rare earth magnet.

3. 3. The curved surface suction device according to claim 1, further comprising a handle portion on the device body for an operator to grip.

4. 4. The curved surface adsorption device according to claim 3, wherein the handle portion extends in a direction away from the rare earth magnet disposed in the device body.

5. A curved surface adsorption device as described in claim 1 or claim 2, wherein the pair of magnetic pole members are arranged in parallel with each other, with the curved surfaces facing outward, on a magnetic material which is the main body of the device, and a pair of rare earth magnets which are arranged in a stacked manner and biased toward one end of the longitudinal direction of the magnetic material.

6. A curved surface adsorption device as described in claim 1 or claim 2, wherein the pair of magnetic pole members are arranged parallel to each other with the curved surfaces facing outward, on a magnetic material which is the main body of the device, and a pair of rare earth magnets which are arranged stacked in the longitudinal center of the magnetic material.

7. A curved surface adsorption device as described in claim 1 or claim 2, wherein the main body of the device is made of non-magnetic material, and a rare earth magnet is arranged biased toward one longitudinal end of the non-magnetic material, and a pair of magnetic pole members are arranged parallel to each other with the curved surface facing outward, sandwiching the rare earth magnet.

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