Multi-stage powder grinding device for metal soft magnetic powder

Abstract

The utility model discloses a multistage powder grinding device for metal soft magnetic powder, which relates to the technical field of metal soft magnetic powder cores and comprises at least two pairs of powder grinding structures arranged in pairs, grinding wheels of each pair of powder grinding structures are symmetrically arranged in a powder grinding cavity at equal height, and the grinding wheels of the at least two pairs of powder grinding structures are arranged in the powder grinding cavity from top to bottom. The distance between each pair of runner wheels is gradually reduced from top to bottom; and each grinding wheel is rotationally mounted on a grinding bracket which is mounted and connected with the grinding cavity, and is driven by a rotation driver to rotate. According to the utility model, sieved large particles are effectively crushed through the multi-stage grinding wheels, so that the size of the agglomerated large particles is reduced, the requirement of subsequent compression molding on the particle size of powder is met, and the material loss in the production process is greatly reduced; by setting the distance between the grinding wheels, the granularity of ground powder can be regulated and controlled, and the compression molding requirement is met; the whole powder grinding process is carried out in the closed cavity, and dust flying and pollution can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of metal soft magnetic powder cores, in particular to a powder grinding device used for grinding soft magnetic powder clusters. Background Art

[0002] Metal soft magnetic powder core is a composite material obtained by pressing metal soft magnetic powder and insulating material into shape using a press. It has excellent properties such as high saturation flux density, low coercive force, low magnetostriction coefficient and low loss. It is widely used in photovoltaic inverters, charging piles, automotive electronics and other fields, and can meet the needs of the development trend of high frequency, high power and miniaturization of electronic devices.

[0003] The metal soft magnetic powder core is obtained by pressing soft magnetic powder into shape. In order to reduce the unreasonable loss of the soft magnetic powder core during the molding process, the soft magnetic powder is often pre-insulated before pressing. That is, the surface of the powder is modified to form a surface insulation layer to avoid direct contact between magnetic powder particles, so that the insulation layer on the surface of the soft magnetic powder can effectively isolate the eddy current path between particles during the operation of the electrical device, greatly reducing the energy consumption of the electrical device and improving the energy efficiency of the electrical device.

[0004] In the process of insulating and coating the soft magnetic powder, it is inevitable that some powder clusters are formed due to stickiness and agglomeration. Powder clusters cannot be pressed and formed normally in the press. Therefore, after the soft magnetic powder is insulatingly coated, it is necessary to screen out the powder clusters that are too large. Especially in the production of low magnetic permeability metal soft magnetic powder cores, in order to ensure the lower magnetic permeability of the metal soft magnetic powder cores, the proportion of insulating material needs to be further increased during the soft magnetic powder coating, which makes it easier to form powder clusters, making this problem particularly prominent in the production of low magnetic permeability metal soft magnetic powder cores. In the prior art, the screened-out powder clusters are discarded as waste, which is not conducive to improving the utilization rate of materials in the production of metal soft magnetic powder cores and controlling production costs. Utility Model Content

[0005] The utility model is to avoid the deficiencies of the prior art and provides a multi-stage powder grinding device for metal soft magnetic powder.

[0006] The utility model adopts the following technical solution to solve the technical problem: a multi-stage grinding device for metal soft magnetic powder, provided with a fixedly installed grinding cavity, the top and bottom of the grinding cavity are respectively provided with a feed inlet and a discharge outlet, including at least two pairs of grinding structures arranged in pairs; the grinding structure is provided with a grinding bracket, a rotating drive machine and a grinding wheel;

[0007] The grinding wheels of each pair of the grinding structures are symmetrically arranged at equal heights in the grinding chamber, and at least two pairs of the grinding wheels of the grinding structures are arranged from top to bottom in the grinding chamber, and the spacing between the pairs of grinding wheels decreases from top to bottom;

[0008] Each of the grinding wheels is rotatably mounted on the grinding bracket connected to the grinding chamber. A rotation driving machine is also fixedly mounted on the grinding bracket. The output end of the rotation driving machine is fixedly connected to the corresponding grinding wheel to drive the grinding wheel to rotate around its own axis.

[0009] Furthermore, the milling structure is also provided with a milling baffle plate arranged in one-to-one correspondence with the milling wheel;

[0010] A pair of the grinding baffles are arranged under the corresponding pair of the grinding wheels in an inclined state with a decreasing spacing from top to bottom, and a gap is left between the two.

[0011] The top of the powder grinding baffle is rotatably mounted on the powder grinding bracket through an elastic connecting piece, and the elastic force of the elastic connecting piece causes the bottoms of a pair of powder grinding baffles to tend to be relatively close to each other in the form of circular swing.

[0012] Furthermore, the milling structure is also provided with a linear drive machine arranged in one-to-one correspondence with the milling wheels;

[0013] The linear drive motor is fixedly mounted on the grinding chamber, and its output end is fixedly mounted on the grinding bracket, and the grinding bracket is mounted and connected to the grinding chamber; a pair of linear drive motor outputs drive a corresponding pair of grinding wheels to move linearly toward or away from each other.

[0014] Furthermore, it also includes a feeding structure arranged at the feeding port; the feeding structure is provided with a material box, a material box support beam, a vibrator, a material box support spring and an elastic plate;

[0015] The material box is inserted into the feed port opened at the top of the grinding cavity, and a gap is left between the material box and the feed port. The material box inlet and the material box outlet opened at the top and bottom are respectively located outside and inside the grinding cavity; the material box support beam is connected and fixed to the outside of the material box;

[0016] The material box support beam is elastically mounted to the top of the upper end surface of the powder grinding chamber through the material box support spring, and the material box is elastically mounted and connected to the powder grinding chamber; the vibrator is fixedly mounted, and its output end is mounted and connected to the material box support beam, and the output drives the material box support beam to reciprocate and vibrate in a vertical linear motion;

[0017] The elastic plate is arranged along the circumference of the material box, with its top edge being sealed and fixed to the outer side wall of the material box, and its bottom edge being sealed and fixed to the edge of the feed port, so as to seal and shield the gap between the material box and the feed port.

[0018] Furthermore, a controller is provided;

[0019] The controller is in data communication with each of the linear drive machine, the rotary drive machine and the vibration machine.

[0020] Furthermore, the feed structure is also provided with a pair of discharge baffles;

[0021] A pair of the discharge baffles are rotatably installed at the bottom of the material box, and form a rotating pair with the material box respectively to support the pair of the discharge baffles to swing, gather, approach or expand and move away, and a gap is left between the pair of the discharge baffles as the outlet of the material box; the discharge baffle is equipped with a locking structure to limit its swing relative to the material box.

[0022] Furthermore, the feeding structure is also provided with a material box cover plate;

[0023] The material box cover is rotatably mounted to the top of the material box, and a rotating pair is formed between the material box and the material box to support the material box cover to swing open to expose the material box inlet and swing closed to cover the material box inlet.

[0024] Furthermore, it also includes a compressed air port provided with a valve; the compressed air port is connected to the air compressor.

[0025] Furthermore, the bottom of the grinding cavity is in a truncated cone-shaped cylindrical structure with a decreasing diameter from top to bottom.

[0026] Furthermore, the grinding chamber is fixed to the base via a fixing bracket, and an openable and closable discharge cover is provided at the discharge port.

[0027] The utility model provides a multi-stage powder grinding device for metal soft magnetic powder, which has the following beneficial effects:

[0028] 1. The utility model effectively crushes the large particles after screening through the multi-stage grinding wheel, reduces the size of the agglomerated large particles, meets the demand for powder particle size in subsequent pressing and molding, and greatly reduces material loss in the production process.

[0029] 2. The utility model adopts a multi-stage powder grinding structure. By setting the grinding wheel spacing, the particle size of the crushed powder can be adjusted to meet the pressing and molding requirements.

[0030] 3. The entire powder crushing process of the utility model is carried out in a closed cavity, which can effectively avoid dust scattering and pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the working state of the utility model;

[0032] Figure 2 It is a partial enlarged structural schematic diagram of the utility model.

[0033] In the figure:

[0034] 1. Grinding structure, 11. Linear drive machine, 12. Grinding wheel, 13. Grinding bracket, 14. Grinding baffle; 2. Base; 3. Fixed bracket; 4. Grinding chamber, 41. Feed inlet, 42. Discharge outlet; 5. Feeding structure, 51. Material box, 52. Material box cover, 53. Discharge baffle, 54. Material box support beam, 55. Vibrating machine, 56. Material box support spring, 57. Elastic plate; 6. Compressed air port. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] A multi-stage grinding device for metal soft magnetic powder, such as Figure 1~Figure 2 As shown, the structural relationship is as follows: a fixedly installed grinding chamber 4 is provided, a feed inlet 41 and a discharge outlet 42 are respectively provided at the top and the bottom of the grinding chamber 4, and at least two pairs of grinding structures 1 are arranged in pairs; the grinding structure 1 is provided with a grinding bracket 13, a rotating driving machine and a grinding wheel 12;

[0037] The grinding wheels 12 of each pair of the grinding structures 1 are symmetrically arranged at the same height in the grinding chamber 4. At least two pairs of the grinding wheels 12 of the grinding structures 1 are arranged from top to bottom in the grinding chamber 4, and the spacing between each pair of grinding wheels 12 decreases from top to bottom.

[0038] Each grinding wheel 12 is rotatably mounted on a grinding bracket 13 connected to the grinding chamber 4. A rotation driving machine is also fixedly mounted on the grinding bracket 13. The output end of the rotation driving machine is fixedly connected to the corresponding grinding wheel 12 to drive the grinding wheel 12 to rotate around its own axis.

[0039] Preferably, the grinding structure 1 is further provided with a grinding baffle 14 arranged in one-to-one correspondence with the grinding wheel 12;

[0040] A pair of grinding baffles 14 are arranged under the corresponding pair of grinding wheels 12 in an inclined state with a decreasing spacing from top to bottom, and a gap is left between the two.

[0041] The top of the powder grinding baffle 14 is rotatably mounted on the powder grinding bracket 13 through an elastic connector. The elastic force of the elastic connector causes the bottoms of the pair of powder grinding baffles 14 to tend to be relatively close to each other in a circular swinging manner.

[0042] The grinding baffle 14 is used to gather the falling powder to the center to prevent the powder from splashing around, and to make the powder fall from the pressure opening between the lower pair of grinding wheels 12 as much as possible to reduce the residual powder in the grinding cavity 4 and improve the grinding effect of the powder clusters to a certain extent.

[0043] Preferably, the grinding structure 1 is further provided with a linear drive machine 11 arranged in one-to-one correspondence with the grinding wheel 12;

[0044] The linear drive machine 11 is installed and fixed on the grinding chamber 4, and its output end is installed and fixed on the grinding bracket 13, and the grinding bracket 13 is installed and connected to the grinding chamber 4; a pair of linear drive machines 11 output drives a corresponding pair of grinding wheels 12 to move linearly towards or away from each other.

[0045] Preferably, it further comprises a feeding structure 5 disposed at the feeding port 41; the feeding structure 5 comprises a material box 51, a material box support beam 54, a vibrator 55, a material box support spring 56 and an elastic plate 57;

[0046] The material box 51 is inserted into the feed port 41 at the top of the grinding chamber 4, and a gap is left between the material box 51 and the feed port 41. The material box inlet and the material box outlet at the top and bottom are respectively located outside and inside the grinding chamber 4. A material box support beam 54 is connected and fixed to the outside of the material box 51.

[0047] The material box support beam 54 is elastically mounted to the top of the upper end surface of the powder grinding chamber 4 through the material box support spring 56, and the material box 51 is elastically mounted and connected to the powder grinding chamber 4; the vibrator 55 is fixedly installed, and its output end is installed and connected to the material box support beam 54, and the output drives the material box support beam 54 to reciprocate and vibrate in a vertical linear motion;

[0048] The feeding structure 5 is intended to realize vibration feeding of soft magnetic powder clusters. Compared with the direct feeding method, vibration feeding can effectively improve feeding uniformity and prevent the soft magnetic powder clusters from blocking the discharge port 42.

[0049] The elastic plate 57 is arranged along the circumference of the material box 51 , with its top edge sealed and fixed to the outer wall of the material box 51 , and its bottom edge sealed and fixed to the edge of the feed port 41 to seal and shield the gap between the material box 51 and the feed port 41 .

[0050] The setting of the elastic plate 57 firstly realizes the sealed connection between the material box 51 and the grinding cavity 4, avoiding the dust problem at the joint between the two. At the same time, it can also play a buffering and protective role in the process of the material box 51 vibrating up and down, preventing the material box 51 and the upper end surface of the grinding cavity 4 from frequent direct friction. Caused by structural damage;

[0051] In actual setting, the elastic plate 57 can be made of a rubber corrugated plate, and its edge is glued and fixed to the outer wall of the material box 51 and the edge of the feed port 41 by glue to form a closed structure; the glue can be Yihe YH-395 rubber special instant glue or Heyi HY-308 metal rubber glue.

[0052] Preferably, a controller is also provided;

[0053] The controller is in data communication with each linear drive machine 11 , the rotary drive machine and the vibration machine 55 .

[0054] In actual settings, the controller can be Mitsubishi MELSEC FX3u-64M PLC.

[0055] Preferably, the feed structure 5 is further provided with a pair of discharge baffles 53;

[0056] A pair of discharge baffles 53 are rotatably installed at the bottom of the material box 51, and form a rotating pair with the material box 51 to support the pair of discharge baffles 53 to swing, gather, approach or expand and move away, and a gap is left between the pair of discharge baffles 53 as the material box outlet; the discharge baffles 53 are equipped with a locking structure to limit their swing relative to the material box 51.

[0057] In actual settings, the swing of the discharge baffle 53 can be driven by the provided discharge baffle motor, and the self-locking function of the discharge baffle motor when it stops can replace the locking function of the locking structure; the aforementioned discharge baffle motor can be connected to the controller data at the same time and accept the control and coordination of the controller.

[0058] Preferably, the feeding structure 5 is further provided with a material box cover plate 52;

[0059] The material box cover plate 52 is rotatably mounted on the top of the material box 51 , and a rotating pair is formed between the material box 51 to support the material box cover plate 52 to swing open to expose the material box inlet and swing closed to cover the material box inlet.

[0060] Preferably, it also includes a compressed air port 6 provided with a valve; the compressed air port is connected to the air compressor.

[0061] In actual production, after the grinding process is completed, the valve can be opened to allow the air compressor to spray compressed air into the grinding cavity 4 through the compressed air port 6 to remove the dust remaining and attached on the grinding structure 1 and in the grinding cavity 4.

[0062] Preferably, the bottom of the grinding chamber 4 is a truncated cone-shaped cylindrical structure with a decreasing diameter from top to bottom.

[0063] Preferably, the grinding chamber 4 is mounted and fixed to the base 2 via a fixing bracket 3 , and an openable and closable discharge cover is provided at the discharge port 42 .

[0064] When used specifically, the following processes are included:

[0065] The first step is to confirm that the discharge baffle 53 and the discharge cover are in a closed state, open the material box cover 52, add a sufficient amount of soft magnetic powder clusters to be crushed into the material box 51, and then close the material box cover 52.

[0066] In the second step, according to the preset allowable spacing and allowable rotational speed between the grinding wheels 12 at each level, the linear drive machine 11 is controlled to drive the grinding bracket 13 to drive the corresponding pair of grinding wheels 12 to move towards or away from each other in a straight line until the spacing between the pair of grinding wheels 12 is consistent with the preset allowable spacing of the grinding wheels 12 at that level. Subsequently, the corresponding rotary drive machine is controlled to adjust the rotational speed of the pair of grinding wheels 12 to be consistent with the allowable rotational speed of the grinding wheels 12 at that level.

[0067] The third step is to start the vibrator 55 and control the vibrator 55 to output vibration with preset vibration parameters, and then swing and adjust a pair of discharge baffles 53 according to a preset allowable blanking speed, so that the pair of discharge baffles 53 swing together or spread apart until the opening of the material box outlet meets the requirement of the allowable blanking speed.

[0068] In the fourth step, the soft magnetic powder clusters in the material box 51 begin to fall from the material box outlet under the action of gravity and the vibration output of the vibrator 55, and pass through the various levels of grinding structures with decreasing pressure outlet sizes from top to bottom, and are correspondingly ground into powder particles with decreasing particle sizes step by step, and finally form soft magnetic powder that meets the pressing requirements of the press, and are discharged from the discharge port 42.

[0069] In the fifth step, after the powder crushing work is completed, the valve at the compressed air port 6 is opened and the air compressor is started. The compressed air is sprayed out from the compressed air port 6 to remove the dust remaining and attached on the powder grinding structure 1 and in the powder grinding cavity 4.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage grinding device for metal soft magnetic powder, comprising a fixedly mounted grinding chamber (4), wherein a feed inlet (41) and a discharge outlet (42) are respectively provided at the top and the bottom of the grinding chamber (4), wherein: It comprises at least two pairs of milling structures (1) arranged in pairs; the milling structures (1) are provided with a milling support (13), a rotary drive machine and a milling wheel (12); The grinding wheels (12) of each pair of the grinding structures (1) are symmetrically arranged at equal heights in the grinding chamber (4); at least two pairs of the grinding wheels (12) of the grinding structures (1) are arranged from top to bottom in the grinding chamber (4), and the spacing between each pair of the grinding wheels (12) decreases from top to bottom; Each of the grinding wheels (12) is rotatably mounted on a grinding support (13) mounted and connected to the grinding chamber (4); a rotation driving machine is also fixedly mounted on the grinding support (13); an output end of the rotation driving machine is fixedly connected to the corresponding grinding wheel (12) to drive the grinding wheel (12) to rotate around its own axis.

2. A multi-stage grinding device for metal soft magnetic powder according to claim 1, characterized in that: The powder grinding structure (1) is further provided with a powder grinding baffle (14) arranged in one-to-one correspondence with the grinding wheel (12); A pair of the powder grinding baffles (14) are arranged below the corresponding pair of the grinding wheels (12) in an inclined state with a decreasing spacing from top to bottom, and a gap is left between the two. The top of the powder grinding baffle (14) is rotatably mounted on the powder grinding bracket (13) via an elastic connecting piece, and the elastic force of the elastic connecting piece causes the bottoms of a pair of powder grinding baffles (14) to tend to be relatively close and close in the form of circular swing.

3. A multi-stage grinding device for metal soft magnetic powder according to claim 1 or 2, characterized in that: The powder grinding structure (1) is further provided with a linear driving machine (11) arranged in one-to-one correspondence with the grinding wheel (12); The linear drive machine (11) is mounted and fixed on the powder grinding chamber (4), and its output end is mounted and fixed on the powder grinding bracket (13), and the powder grinding bracket (13) is mounted and connected to the powder grinding chamber (4); a pair of linear drive machines (11) output drives a corresponding pair of grinding wheels (12) to move linearly towards each other or away from each other.

4. A multi-stage grinding device for metal soft magnetic powder according to claim 3, characterized in that: It also includes a feeding structure (5) disposed at the feeding port (41); the feeding structure (5) is provided with a material box (51), a material box support beam (54), a vibrator (55), a material box support spring (56) and an elastic plate (57); The material box (51) is inserted into the material feed port (41) provided at the top of the grinding chamber (4), with a gap between the material box and the material feed port (41), and the material box inlet and the material box outlet provided at the top and the bottom thereof are respectively located outside and inside the grinding chamber (4); the material box support beam (54) is connected and fixed to the outside of the material box (51); The material box support beam (54) is elastically mounted to the top of the upper end surface of the powder grinding chamber (4) through the material box support spring (56), so that the material box (51) is elastically mounted and connected to the powder grinding chamber (4); the vibration machine (55) is fixedly mounted, and its output end is mounted and connected to the material box support beam (54), and the output drives the material box support beam (54) to perform linear motion along a vertical reciprocating vibration; The elastic plate (57) is arranged along the circumference of the material box (51), with its top edge being sealed and fixed to the outer side wall of the material box (51), and its bottom edge being sealed and fixed to the edge of the feed opening (41), so as to seal and shield the gap between the material box (51) and the feed opening (41).

5. A multi-stage grinding device for metal soft magnetic powder according to claim 4, characterized in that: A controller is also provided; The controller is in data communication with each of the linear drive machines (11), the rotary drive machine and the vibration machine (55).

6. A multi-stage grinding device for metal soft magnetic powder according to claim 5, characterized in that: The feeding structure (5) is further provided with a pair of discharge baffles (53); A pair of the discharge baffles (53) are rotatably mounted on the bottom of the material box (51), and form a rotation pair with the material box (51) to support the pair of the discharge baffles (53) to swing, gather, approach or spread apart, and a gap is left between the pair of the discharge baffles (53) as the outlet of the material box; the discharge baffles (53) are equipped with a locking structure to limit the swing of the baffles relative to the material box (51).

7. A multi-stage grinding device for metal soft magnetic powder according to claim 4, characterized in that: The feeding structure (5) is also provided with a material box cover plate (52); The material box cover plate (52) is rotatably mounted on the top of the material box (51), and a rotating pair is formed between the material box (51) and the material box (51) to support the material box cover plate (52) to swing open to expose the material box inlet and swing closed to cover the material box inlet.

8. The multi-stage grinding device for metal soft magnetic powder according to claim 1, characterized in that: It also includes a compressed air port (6) provided with a valve; the compressed air port is connected to the air compressor.

9. The multi-stage grinding device for metal soft magnetic powder according to claim 1, characterized in that: The bottom of the grinding cavity (4) is in the form of a truncated cone-shaped cylinder with a decreasing diameter from top to bottom.

10. The multi-stage grinding device for metal soft magnetic powder according to claim 1, characterized in that: The powder grinding chamber (4) is mounted and fixed to the base (2) via a fixing bracket (3), and an openable and closable discharge cover is provided at the discharge port (42).

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