Magnetically soft alloy powder vibration mill

Abstract

The utility model provides a magnetically soft alloy powder vibration mill which comprises a locking device, a vibration excitation device, an elastic supporting device, a transmission shaft device, an eccentric hammer device, a driving motor and a machine base, the elastic supporting device supports the locking device, the vibration excitation device is arranged in the center of the locking device and driven by the transmission shaft device, and the transmission shaft device is driven by the driving motor and driven by the eccentric hammer device. The engine base supports the elastic supporting device, the locking device is connected with the vibration excitation device, the tank body is placed on the locking device, the tank body is composed of a high manganese steel vibration grinding tank, a striking ring and a striking block, the vibration grinding tank is provided with a magnetic field generating device, and the magnetic field generating device generates a magnetic field around the tank body. The magnetically soft alloy powder vibration mill is low in energy consumption, convenient and fast, and the preset magnetically soft alloy powder particle size can be obtained according to actual needs.

Description

Technical Field

[0001] The invention relates to the field of soft magnetic alloy processing, in particular to a soft magnetic alloy powder vibration mill. Background Art

[0002] Vibration mill is a fine or ultra-fine grinding equipment that uses grinding media to impact materials in a high-frequency vibration cylinder, and crushes materials through friction and shearing. It is widely used in industrial fields such as ceramics, medicine, building materials, and powder metallurgy. The characteristic of vibration mill is that the vibration powder efficiency increases monotonically with the increase of vibration intensity. Increasing vibration intensity can be achieved by increasing vibration frequency or amplitude, but increasing vibration frequency will reduce bearing life and reduce grinding effect.

[0003] If a vibration mill is used to grind soft magnetic alloy powder, due to the small particle size and high density of the alloy powder, the contact area between the vibration mill and the vibration roller is small during stirring, and the forward extrusion expansion and shear collision of the alloy powder are smaller than those of ordinary powders. The vibration milling of soft magnetic alloy powder takes a long time and consumes a lot of energy, and the particle size after vibration milling is not uniform. Therefore, a vibration mill specifically for soft magnetic alloy powder is urgently needed. Summary of the invention

[0004] The present invention utilizes the characteristics of soft magnetic alloy powder to transform the structure of the vibration mill, with the goal of improving the effect of vibration grinding of soft magnetic alloy powder and reducing vibration grinding energy consumption, and provides a soft magnetic alloy powder vibration mill. The specific technical scheme is as follows.

[0005] A soft magnetic alloy powder vibration mill comprises a locking device, an exciting device, an elastic supporting device, a transmission shaft device, an eccentric hammer, a driving motor and a machine base, wherein the elastic supporting device supports the locking device, the exciting device is arranged in the center of the locking device and driven by the transmission shaft device, the transmission shaft device is driven by the driving motor, and the machine base supports the elastic supporting device, wherein a magnetic field generating device is arranged around the vibration mill.

[0006] In an embodiment of the present invention, the magnetic field generating device includes a DC coil, a DC electromagnet or a permanent magnet.

[0007] In the embodiment of the present invention, the input particle size of the soft magnetic alloy is 0.5-10 mm, and the output particle size of the soft magnetic alloy (powder below 200 mesh) has an average particle size of 30-60 μm, accounting for 15-70%.

[0008] According to an embodiment of the present invention, the filling rate of the vibration mill jar is 0.4-0.7.

[0009] The soft magnetic alloy powder vibration mill of the present invention has low energy consumption, is convenient and fast, and can obtain a predetermined soft magnetic alloy powder particle size according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the main devices of the vibration mill in the prior art.

[0011] Figure 2 It is a diagram of the tank structure of a vibrating mill in the prior art.

[0012] Figure 3 It is a schematic diagram of the vibration excitation device of the vibration mill of the first embodiment.

[0013] Figure 4 It is a schematic diagram of the vibration excitation device of the vibration mill of the second embodiment.

[0014] Figure 5 It is a schematic diagram of the vibration excitation device of the vibration mill of the third embodiment.

[0015] Figure 6 This is a particle size distribution diagram of the soft magnetic alloy powder vibrated by the vibration mill of Example 1.

[0016] Figure 7 It is a particle size distribution diagram of the soft magnetic alloy powder vibrated by the vibration mill of Example 2.

[0017] Figure 8 This is a particle size distribution diagram of the soft magnetic alloy powder vibrated by the vibration mill of Example 3.

[0018] Description of symbols

[0019] 1-soft magnetic alloy powder vibration mill; 11-locking device; 12-excitation device; 13-elastic support device; 14-transmission shaft device; 15-eccentric hammer; 16-driving motor; 17-machine base; 121-vibration mill; 122-strike block; 1221-strike ring; 1211-DC line; 1212-embedded permanent magnet; 1213-DC electromagnet. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See first Figure 1 and Figure 2The vibration mill 1 of the prior art is briefly described. The vibration mill 1 includes a locking device 11, a vibration device 12, an elastic support device 13, a transmission shaft device 14, an eccentric weight 15, a drive motor 16 and a machine base 17. The elastic support device 13 supports the locking device 11. The vibration device 12 is arranged at the center of the locking device 11 and driven by the transmission shaft device 14. The transmission shaft device 14 is driven by the drive motor 16. The machine base 17 supports the elastic support device 13.

[0022] The working principle of the vibration mill 1 is as follows: the strong centrifugal force and vibration force generated by the eccentric hammer 15 on the vibration device 12 of the vibration mill 1 causes the vibration steel body to generate exciting force, and the vibration mill jar 121 pressed on the vibration steel body generates strong vibration. The material is placed in the sealed vibration mill jar 121, and is crushed and ground by the impact block 122 and the impact ring 1221 to achieve the powder making effect.

[0023] Soft magnetic alloy powder is a magnetic material with low coercivity and high magnetic permeability. Soft magnetic materials are easy to magnetize and demagnetize, and are widely used in electrical and electronic equipment. There are many kinds of soft magnetic materials, which are usually divided according to their composition: ① Pure iron and low carbon steel: including electromagnetic pure iron, electrolytic iron and carbonyl iron, especially high saturation magnetization; but its resistivity is low and eddy current loss is large under alternating magnetic field. ② Iron-silicon alloy: After adding silicon to pure iron, the phenomenon that the magnetic properties of magnetic materials change with the use time can be eliminated. ③ Iron-aluminum alloy: has good soft magnetic properties, high magnetic permeability and resistivity. ④ Iron-silicon-aluminum alloy: adding silicon to binary iron-aluminum alloy to obtain high hardness, saturation magnetic induction intensity, magnetic permeability and resistivity. ⑤ Nickel-iron alloy: can control magnetic properties to obtain soft magnetic materials such as high magnetic permeability, constant magnetic permeability and moment magnetic. ⑥ Iron-cobalt alloy: has high saturation magnetization and low resistivity. ⑦ Soft ferrite: non-metallic ferromagnetic soft magnetic material. High resistivity, lower saturation magnetization than metal. ⑧ Amorphous soft magnetic alloy: high magnetic permeability and resistivity. In addition, its Curie point is much lower than that of crystalline soft magnetic materials. ⑨ Ultrafine crystal soft magnetic alloy: high magnetic permeability, small iron loss, high saturation magnetic induction intensity and good stability. From the above, it can be seen that soft magnetic alloy powders are magnetic. However, the density of soft magnetic alloy powders is generally large (although the hardness is also large, it is brittle). During vibration grinding, the vibration grinding block will encounter greater resistance when pushing the powder to rotate. A part of the soft magnetic alloy powder has never been in contact with the vibration grinding block for effective vibration grinding, so the vibration grinding efficiency will be reduced.

[0024] The results of existing equipment vibrating and grinding soft magnetic alloy materials

[0025]

[0026] According to the above analysis of the soft magnetic alloy powder, the present invention utilizes the magnetic properties of the soft magnetic alloy powder, and sets a magnetic field generating device in the vibration mill 121. The magnetic field generating device generates a certain height magnetic field around the tank body, which can absorb the material at the bottom onto the tank wall and the striking ring, so that the striking ring 1221, the striking block 122 and the vibration mill 121 can hit the material when they collide with each other. The magnetic field generating device can generate a magnetic field, thereby generating a magnetic force that makes the soft magnetic alloy powder move along the magnetic field direction. The soft magnetic alloy powder can adhere to the striking ring 1221, the striking block 122 and the vibration mill 121, and increase the vibration mill area of ​​the soft magnetic alloy powder. The magnetic field generating device used in the present invention includes a DC line, a DC electromagnet, a permanent magnet, etc.

[0027] In addition, it should be noted that since the powder is a soft magnetic alloy powder, the component parameters of the vibration mill of the present invention need to be adjusted according to the properties of the powder, and the striking ring, striking block and tank body are made of high manganese steel, which have sufficient hardness to ensure that the soft magnetic alloy powder can be effectively vibrated. The feed particle size of the soft magnetic alloy is 0.5-10 mm, and the average particle size of the soft magnetic alloy output particle size is less than 74 μm, which is 30-60 μm, accounting for 15-70%. Due to the provision of a magnetic field generating device, the feed particle size of the soft magnetic alloy powder can be larger, the output particle size can be smaller, and the vibration grinding effect is better. Example 1

[0028] See also Figure 3 , a DC coil is set on the tank wall of the vibration mill as a magnetic field generating device. The DC coil is evenly wound on the tank wall to generate a magnetic field approximately perpendicular to the axis of the locking device 11. The soft magnetic alloy powder adheres to the tank wall, the striking ring 1221 and the striking block 122 of the vibration mill 121, and the contact area of ​​the vibration mill is increased. The feed particle size of the soft magnetic alloy is selected to be 11 mm, and the filling rate of the vibration mill is 0.44. After the vibration mill is completed, the average particle size of the output particle size of the soft magnetic alloy (material under the 200 mesh sieve) is 56.23 μm, accounting for 18.6%, which is determined by the particle size with the largest specific gravity in the particle size distribution diagram according to the detection results of the laser particle size analyzer.

[0029] Example 1: Results of vibrating and grinding soft magnetic alloy materials

[0030] Example 2

[0031] See also Figure 4, an embedded permanent magnet is set on the wall of the vibration mill as a magnetic field generating device. The embedded permanent magnets are evenly arranged on the wall of the tank to generate a magnetic field approximately perpendicular to the axis of the locking device 11. The soft magnetic alloy powder adheres to the tank wall, the striking ring 1221 and the striking block 122 of the vibration mill 121, and the area of ​​vibration contact increases. The feed particle size of the soft magnetic alloy is selected to be 11 mm, and the filling rate of the vibration mill is 0.51. After the vibration mill is completed, the average particle size of the output particle size of the soft magnetic alloy (material under the 200 mesh sieve) is 37.58 μm, accounting for 55.8%. According to the test results of the laser particle size analyzer, it is determined by the particle size with the largest specific gravity in the particle size distribution diagram.

[0032] Example 2 Results of Vibration Grinding of Soft Magnetic Alloy Material

[0033] Example 3

[0034] See also Figure 5 , a DC electromagnet is set on the tank wall of the vibration mill as a magnetic field generating device. The DC electromagnet is evenly spaced and aligned with the tank wall to generate a magnetic field. The soft magnetic alloy powder adheres to the tank wall, the striking ring 1221 and the striking block 122 of the vibration mill 121, and the contact area of ​​the vibration mill is increased. The feed particle size of the soft magnetic alloy is selected to be 11 mm, and the filling rate of the vibration mill is 0.39. After the vibration mill is completed, the average particle size of the output particle size of the soft magnetic alloy (material under the 200 mesh sieve) is 31.58μm, accounting for 65.1%, which is determined by the particle size with the largest specific gravity in the particle size distribution diagram according to the detection results of the laser particle size analyzer.

[0035] Example 3: Results of vibrating and grinding soft magnetic alloy materials

[0036]

[0037] From the comparison of the above data, it can be seen that the soft magnetic alloy powder obtained by the vibration mill of the present invention is smaller in particle size than that of the vibration mill of the prior art, and the proportions of -200+150 μm, -150+74 μm, and -74 μm are all larger.

[0038] According to the above embodiments, it can be known that the vibration mill of the present invention increases the vibration contact area of ​​the soft magnetic alloy powder and improves the vibration efficiency by providing a magnetic field generating device. The particle size of the obtained soft magnetic alloy powder can actually be controlled by the intensity of the magnetic field. The vibration mill of the present invention is easy to operate and has low energy consumption, and is very suitable for the vibration grinding process of soft magnetic alloy powder.

[0039] It will be easily understood by those skilled in the art that the above description is merely an example of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft magnetic alloy powder vibration mill, comprising a locking device, an exciting device, an elastic supporting device, a transmission shaft device, an eccentric hammer, a driving motor and a machine base, wherein the elastic supporting device supports the locking device, the exciting device is arranged in the center of the locking device and driven by the transmission shaft device, the transmission shaft device is driven by the driving motor, and the machine base supports the elastic supporting device, wherein: A magnetic field generating device is arranged around the vibrating grinding tank.

2. The soft magnetic alloy powder vibrating mill according to claim 1, wherein: The magnetic field generating device includes a DC coil, a DC electromagnet or a permanent magnet.

3. The soft magnetic alloy powder vibrating mill according to claim 1, wherein: The input particle size of the soft magnetic alloy is 0.5-10 mm, and the average particle size of the powder below 200 mesh in the output particle size of the soft magnetic alloy is 30-60 μm.

4. The soft magnetic alloy powder vibrating mill according to claim 1, wherein: The filling rate of the vibration mill jar is 0.4-0.7.

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