Magnetic circuit structure of switch type permanent magnetic chuck

Abstract

The utility model discloses a magnetic circuit structure of a switch type permanent magnetic chuck, which comprises at least three fixed permanent magnets, a rotary permanent magnet is movably arranged between every two adjacent fixed permanent magnets, the magnetic poles of every two adjacent fixed permanent magnets are arranged in opposite directions, and the magnetic poles of every two adjacent rotary permanent magnets are also arranged in opposite directions. The magnetic pole pointing directions of the fixed permanent magnet and the rotary permanent magnet are perpendicular to each other; the fixed permanent magnet and the rotary permanent magnet jointly form a working face, and the magnetic attraction force of the working face can be changed by rotating the rotary permanent magnet. According to the technical scheme, under the condition that the size is the same, compared with an existing switch type permanent magnetic chuck, larger adsorption force can be generated, attenuation of the adsorption force is small along with increase of a gap, the permanent magnetic chuck can be used under the condition that the gap between the permanent magnetic chuck and an adsorbed object is large, and the application scene of the permanent magnetic chuck is further expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to permanent magnet chuck technical field, especially a switch mode permanent magnet chuck's magnetic circuit structure. BACKGROUND

[0002] The switch mode permanent magnet chuck structure that present widely uses usually comprises the iron yoke of the magnetic conductive material, fixed magnet and rotatable magnet, and the polarity of fixed magnet and rotatable magnet is same in the adsorption working condition, forms the magnetic circuit closure through the iron yoke and the object of being attracted, and the magnetic field intensity of adsorption surface is enhanced, and adsorption force increases to realize the adsorption function. When the fixed magnet and rotatable magnet polarity is opposite in the release condition, the magnetic circuit short circuit is formed through the iron yoke, so that the output magnetic field intensity on the working surface greatly reduces, and the adsorption force also greatly reduces, thereby realizing the release function.

[0003] But the permanent magnet chuck of this form owing to the characteristics of magnetic circuit structure, only in the state that the iron yoke and the object of being attracted are in close contact can produce enough adsorption force, and with the increase of gap, adsorption force will quickly reduce, and it is not suitable for the application occasion with certain gap, and the use range of this kind of chuck is limited. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the utility model is to provide a switch mode permanent magnet chuck's magnetic circuit structure, which can produce greater adsorption force than the existing switch mode permanent magnet chuck under the condition of the same volume, and the adsorption force decays less with the increase of gap, can meet the use under the condition of larger gap between the adsorbed object and the object of being attracted, and further expands the application scenario of permanent magnet chuck.

[0005] To achieve the above object, the utility model provides a switch mode permanent magnet chuck's magnetic circuit structure, which comprises:

[0006] At least three fixed permanent magnets, wherein, the rotatable permanent magnet is movably arranged between each adjacent two fixed permanent magnets, the magnetic poles of each adjacent two fixed permanent magnets are oppositely arranged, the magnetic poles of each adjacent two rotatable permanent magnets are oppositely arranged, and the magnetic pole pointing directions of the fixed permanent magnets and the rotatable permanent magnets are perpendicular to each other;

[0007] The fixed permanent magnets and the rotatable permanent magnets jointly form a working surface, and rotating the rotatable permanent magnet can change the magnetic attraction force of the working surface.

[0008] In an embodiment of the utility model, the shape of the rotatable permanent magnet is a cylinder, the fixed permanent magnet is recessed to form a containing portion on the side surface facing the rotatable permanent magnet, and the rotatable permanent magnet is attached to the containing portion.

[0009] In an embodiment of the utility model, the fixed permanent magnet is bonded with a magnetic conductive plate on the back surface of the working surface.

[0010] In an embodiment of the utility model, the material of the magnetic conducting plate is low carbon steel or iron-based amorphous material.

[0011] In an embodiment of the utility model, the material of the fixed permanent magnet and the rotating permanent magnet is neodymium iron boron or samarium cobalt or samarium iron nitrogen or mixture of the above materials.

[0012] The technical scheme of the utility model arranges the fixed permanent magnet and the rotating permanent magnet to form a Halbach array, which can generate greater adsorption force than the existing on-off permanent magnetic chuck under the condition of the same volume, and the adsorption force attenuates less with the increase of the gap, can meet the use under the condition of larger gap between the adsorbed object, and further expands the application scenario of the permanent magnetic chuck. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in the drawings without creative labor.

[0014] Figure 1 It is the adsorption state structural diagram of the existing on-off permanent magnetic chuck;

[0015] Figure 2 It is the release state structural diagram of the existing on-off permanent magnetic chuck;

[0016] Figure 3 It is the adsorption state structural diagram of the on-off permanent magnetic chuck of the utility model;

[0017] Figure 4 It is the release state structural diagram of the on-off permanent magnetic chuck of the utility model.

[0018] Explanation of the attached drawings:

[0019] 1, iron yoke;2, fixed permanent magnet;21, containing part;3, rotating permanent magnet;4, working surface;5, magnetic conducting plate;6, workpiece.

[0020] The realization, functional characteristics and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0022] With reference to Figures 3 to 4 The utility model provides a magnetic circuit structure of switch type permanent magnetic chuck, including at least three fixed permanent magnets 2, wherein, the rotatory permanent magnet 3 is movably arranged between every two adjacent fixed permanent magnets 2, and the magnetic poles of every two adjacent fixed permanent magnets 2 are reversely arranged, and the magnetic poles of every two adjacent rotatory permanent magnets 3 are also reversely arranged, and the magnetic pole pointing direction of fixed permanent magnet 2 and rotatory permanent magnet 3 is perpendicular to each other;Fixed permanent magnet 2 and rotatory permanent magnet 3 jointly form a working surface 4, and rotating rotatory permanent magnet 3 can change the magnetic attraction force of working surface 4.

[0023] Understandably, fixed permanent magnet 2 is rectangular, and rotatory permanent magnet 3 is cylindrical magnet arranged between two fixed permanent magnets 2, the magnetic poles of every two adjacent fixed permanent magnets 2 are reversely arranged, the magnetic poles of every two adjacent rotatory permanent magnets 3 are also reversely arranged, and the magnetic pole pointing direction of fixed permanent magnet 2 and rotatory permanent magnet 3 is perpendicular to each other, forming a Halbach array.

[0024] Halbach array is a kind of magnet structure, it is approximately ideal structure in engineering, using special magnet arrangement, enhance the field intensity in unit direction, the goal is to produce the strongest magnetic field with the least amount of magnet. This array is entirely composed of permanent magnetic material, by arranging different magnetization direction permanent magnet according to certain rule, can converge magnetic force line on one side of magnet, and weaken magnetic force line on the other side, to obtain ideal single-sided magnetic field.

[0025] In the embodiment, working surface 4 is the side of converging magnetic force line, and rotatory permanent magnet 3 can be rotated, when the magnetic pole of rotatory permanent magnet 3 is rotated to the direction shown in the figure, through the magnetic circuit closure formed by iron yoke 1 and the attracted object, the magnetic field intensity of working surface 4 is enhanced, and the adsorption force is increased, at this time, the magnetic attraction force of working surface 4 is the strongest, at this time, workpiece 6 can be adsorbed. Figure 3 Figure 4 When the magnetic pole of rotatory permanent magnet 3 is rotated to the direction shown in the figure, the magnetic circuit short circuit is formed by iron yoke 1, so that the output magnetic field intensity on working surface 4 is greatly reduced, and the adsorption force is also greatly reduced, at this time, workpiece 6 can be removed.

[0026] The embodiment adopts the Halbach magnetic circuit structure of optimization design, under the condition of the same total volume, compared with the existing switch type permanent magnetic chuck (see Figure 1 , 2 ​)Can produce greater adsorption force, while due to the characteristics of the magnetic circuit structure, its adsorption force with the gap increases and decays smaller, can meet the use of larger gap between the adsorbed objects.

[0027] Referring to Figures 3 to 4 In an embodiment of the present application, the shape of the rotating permanent magnet 3 is a cylinder, the fixed permanent magnet 2 is recessed on the side facing the rotating permanent magnet 3 to form a receiving portion 21, and the rotating permanent magnet 3 is closely arranged in the receiving portion 21.

[0028] It can be understood that the rotating permanent magnet 3 is designed as a cylindrical shape, which makes it run smoothly when rotating and facilitates cooperation with the fixed permanent magnet 2. The surface of the fixed permanent magnet 2 on the side facing the rotating permanent magnet 3 is designed as a recessed shape, which is designed to accommodate the rotating permanent magnet 3 so that it can be embedded and freely rotate. The rotating permanent magnet 3 is closely arranged in the receiving portion 21, which can ensure that the rotating permanent magnet 3 can rotate smoothly without being stuck due to the gap or mismatch.

[0029] Referring to Figures 3 to 4 In an embodiment of the present application, the fixed permanent magnet 2 is bonded with a magnetic guide plate 5 on the back of the working surface 4.

[0030] It can be understood that the working surface 4 is the surface that is adsorbed with the workpiece 6 and is the part of the chuck that functions. The magnetic guide plate 5 is bonded on the back of the working surface 4, and the main function of the magnetic guide plate 5 is to guide and concentrate the magnetic field and improve the efficiency of the magnetic force. The magnetic guide material usually has high magnetic permeability, which can effectively guide the magnetic field from the permanent magnet to the working surface 4, thereby enhancing the adsorption force. The adhesive between the magnetic guide plate 5 and the magnet can be rubber, nylon, PPS, epoxy resin, etc., which can be formed by hot extrusion or injection molding, which is not limited further.

[0031] By adding a magnetic guide plate 5 on the back of the fixed permanent magnet 2, the entire magnetic circuit structure can be optimized, so that the generated magnetic field is more concentrated and stronger, thereby improving the performance of the chuck. This design enhances the adsorption effect, so that the chuck can more effectively adsorb various workpieces 6 when in use.

[0032] Referring to Figures 3 to 4 In an embodiment of the present application, the material of the magnetic guide plate 5 is low carbon steel or iron-based amorphous material.

[0033] It is understandable that both low carbon steel and iron-based amorphous material have high magnetic permeability, which can effectively guide and concentrate the magnetic field and enhance the adsorption force of the permanent magnet, making the suction cup more efficient when working. Low carbon steel is easy to process and form, which can be easily made into the required shape and size to adapt to different application requirements. Low carbon steel may need a coating to prevent rust, and iron-based amorphous material may have good corrosion resistance in some cases, prolonging the service life. Low carbon steel has good mechanical strength and toughness, which can withstand certain physical pressure and impact force to ensure the stability of the magnetic guide plate 5 under working conditions. Low carbon steel is a relatively cheap material, which can reduce production costs. While iron-based amorphous material is relatively expensive, its performance advantages can improve overall efficiency in specific applications and bring long-term economic benefits.

[0034] Referring to Figures 3 to 4 In an embodiment of the present application, the materials of the fixed permanent magnet 2 and the rotating permanent magnet 3 are neodymium iron boron or samarium cobalt or samarium iron nitrogen or a mixture of the above materials.

[0035] It is understandable that neodymium iron boron is one of the highest magnetic energy products of permanent magnet materials known at present, which can generate a very strong magnetic field, making the device achieve high adsorption force in a small volume. Samarium cobalt permanent magnet has excellent high temperature performance and can maintain stable magnetism at high temperature, suitable for high temperature working environment. Samarium iron nitrogen also has certain high temperature resistance. Samarium cobalt material usually has good corrosion resistance, suitable for use in humid or corrosive environment, which helps to prolong the service life of the permanent magnet. The mixture of different materials can optimize the magnetic performance to meet the specific application requirements, for example, in the case of requiring high magnetic strength and high temperature stability, a mixture of neodymium iron boron and samarium cobalt can be selected.

[0036] The technical scheme of the utility model arranges the fixed permanent magnet 2 and the rotating permanent magnet 3 to form a Halbach array, which can generate greater adsorption force than the existing on-off type permanent magnet suction cup under the condition of the same volume, and the adsorption force attenuates less with the increase of the gap, which can meet the use under the condition of larger gap between the adsorbed object and the permanent magnet suction cup, further expanding the application scenarios of the permanent magnet suction cup.

[0037] In the drawings of the embodiment, the same or similar reference signs correspond to the same or similar parts; in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary description, and cannot be understood as a limitation on the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] The above merely provides the preferred embodiment of the present application, and not intended to limit the present application. Accordingly, any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A magnetic circuit structure of a switched permanent magnetic chuck, characterized by, The application relates to a magnetic field generator comprising: at least three fixed permanent magnets (2), wherein a rotating permanent magnet (3) is movably arranged between every two adjacent fixed permanent magnets (2), and the magnetic poles of every two adjacent fixed permanent magnets (2) are oppositely arranged, and the magnetic poles of every two adjacent rotating permanent magnets (3) are oppositely arranged, and the magnetic pole pointing directions of the fixed permanent magnets (2) and the rotating permanent magnets (3) are perpendicular to each other; the fixed permanent magnets (2) and the rotating permanent magnets (3) jointly form a working surface (4), and rotating the rotating permanent magnets (3) can change the magnetic attraction force of the working surface (4).

2. The magnetic circuit structure of a switched permanent magnetic chuck according to claim 1, characterized in that, The rotating permanent magnet (3) is in the shape of a cylinder, the fixed permanent magnet (2) is recessed on the side face facing the rotating permanent magnet (3) to form a containing portion (21), and the rotating permanent magnet (3) is arranged in close contact with the containing portion (21).

3. The magnetic circuit structure of a switched permanent magnetic chuck according to claim 2, characterized in that The fixed permanent magnet (2) is bonded with a magnetic conducting plate (5) on the back face of the working surface (4).

4. The magnetic circuit structure of a switched permanent magnetic chuck according to claim 3, characterized in that The material of the magnetic conducting plate (5) is low-carbon steel or iron-based amorphous material.

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