Anti-attrition device for discharge of jet mill
By designing a grinding reduction device in the airflow grinding, and using nitrogen purge to purify the powder residue into the section C discharge pipe, the powder sand holes, impurities and fire risks caused by the wear of plastic wire pipes are solved, and the effect of reducing powder waste and extending the service life of the discharge wire pipes is achieved.
Patent Information
- Application Number
- CN202421705173.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-18
AI Technical Summary
In the existing airflow grinding, the inner wall of the plastic wire pipe is severely washed and worn, resulting in the wear of the wire pipe wire and the plastic inner wall of the wire pipe are mixed in the powder, causing harmful factors such as powder sand holes and impurities, and there is a risk of powder fire. Regular inspection and replacement of the output wire pipe.
A grinding and reducing device for airflow grinding and discharge is designed, including a first flange, a second flange and a discharge wire tube. By providing nitrogen inlet and air outlet holes and a capillary connected thereto in the pipe wall of the A section discharge tube, the residual powder residue is purged into the section C section discharge tube and blown away along the powder outlet tube.
It effectively avoids the fire risk caused by powder residues, reduces the waste of powder of appropriate particle size, and extends the service life of the discharge wire pipe, avoiding the trouble of regular inspection and replacement.
Smart Images
Figure CN222872357U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of grinding of NdFeB permanent magnet materials, in particular to a friction reducing device for airflow milling material in the process of airflow milling powder making. Background Art
[0002] At present, in the production of known air jet mills, in order to ensure that the weight of the grinding chamber is optional and effective, the feed port and the discharge port of the grinding chamber of the air jet mill are connected by plastic steel wire hoses (some manufacturers use soft rubber sleeves for connection). On the one hand, it is convenient to observe whether the feeding and discharging are normal, and on the other hand, the weight in the grinding chamber is accurately measured.
[0003] See also Figure 1 In actual production, the discharge wire pipe 6 is usually directly connected to the discharge pipe 9 when the material comes out of the grinding chamber 4, without Figure 1 The first flange 5 and the second flange 7 components in the grinding chamber. Therefore, the powder produced from the grinding chamber enters the cyclone separator through the discharge port steel wire pipe at a high speed under constant pressure. During the powder discharge process, the powder spiral passes through the plastic steel wire pipe, causing scouring and wear on the inner wall of the steel wire pipe. The worn debris of the steel wire pipe and the inner wall of the plastic are mixed in the powder and enter the powder, which is one of the harmful factors causing sand holes and impurities in the powder. At the same time, due to the wear of the steel wire pipe, the wall of the pipe becomes thinner or even leaks, there is a risk of powder ignition, and the discharge steel wire pipe 6 needs to be regularly inspected and replaced.
[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content
[0005] The purpose of the utility model is to provide a friction reducing device for air flow mill discharge, which can well overcome the problems in the prior art that the inner wall of the plastic steel wire tube is severely eroded and worn, the debris of the steel wire of the steel wire tube and the worn plastic inner wall are mixed in the powder and enter the powder, causing harmful factors such as sand holes and impurities in the powder, at the same time, the risk of powder ignition caused by reasons such as wear of the steel wire tube, thinning of the tube wall and even leakage, and the trouble of regular inspection and replacement of the discharge steel wire tube.
[0006] To achieve the above-mentioned purpose, the utility model provides a friction reducing device for air flow mill discharge, the friction reducing device is used for air flow mill powder making equipment, the friction reducing device comprises a first flange, a second flange and a discharge wire pipe; one end of the first flange is sealingly connected to the discharge flange of the grinding chamber of the air flow mill powder making equipment, and the other end of the first flange is sequentially provided with a section A discharge pipe and a section B discharge pipe, and the outer diameter of the section B discharge pipe is smaller than the outer diameter of the section A discharge pipe; one end of the second flange is sealingly connected to the feed flange of the powder discharge pipe of the air flow mill powder making equipment, and the other end of the second flange is provided with a section C discharge pipe, and the inner diameter of the section C discharge pipe is larger than the outer diameter of the section B discharge pipe, so that the section B discharge pipe can penetrate into the interior of the section C discharge pipe; the two ends of the discharge wire pipe are respectively sleeved on the outer diameters of the section A discharge pipe and the section C discharge pipe.
[0007] In a preferred embodiment, the first flange also includes a plurality of air outlet holes, which are parallel to the central axis of the section A discharge pipe and evenly distributed inside the tube wall of the section A discharge pipe. The outlets of the plurality of air outlet holes are located at the end face of the section A discharge pipe and outside the outer wall of the section B discharge pipe.
[0008] In a preferred embodiment, the first flange further includes a plurality of air inlet holes, the axis of which intersects perpendicularly with the central axis of the discharge pipe of section A and is evenly distributed on the outer wall of the discharge pipe of section A, and each air inlet hole is connected to an air outlet hole.
[0009] In a preferred embodiment, the friction reduction device of the air flow mill discharge also includes a capillary, which is arranged between the end face of the discharge pipe of section A and the end face of the discharge pipe of section C, and is located between the inner wall of the discharge wire tube and the outer wall of the discharge pipe of section B. One end of the capillary is sealed and connected to the outlet of the air outlet, and the other end is located near the end face of the discharge pipe of section C.
[0010] In a preferred embodiment, the other end of the partial capillary has an elbow.
[0011] In a preferred embodiment, the elbow faces the outer wall of the B-section discharge pipe, the end face of the A-section discharge pipe or the inner wall of the discharge wire pipe.
[0012] In a preferred embodiment, the friction reduction device for the jet mill discharge further comprises an air inlet quick-release connector, one end of which is sealed on the inlet of the air inlet hole, and the other end of the air inlet quick-release connector is used to connect to a nitrogen source.
[0013] In a preferred embodiment, the friction reduction device of the air flow mill discharge also includes a pipe clamp, which is arranged on the outer wall of both ends of the discharge steel wire pipe, and the pipe clamp is used to seal and fix the discharge steel wire pipe with the A section discharge pipe and the C section discharge pipe.
[0014] In a preferred embodiment, the air flow grinding equipment also includes a feed wire pipe, a feeder and a medium powder tank; the lower end of the feed wire pipe is sealed connected to the feed port of the grinding chamber; the lower discharge port of the feeder is sealed connected to the upper end of the feed wire pipe; and the lower discharge port of the medium powder tank is sealed connected to the feed port of the feeder.
[0015] In a preferred embodiment, the airflow grinding equipment also includes a cyclone separator, a vibrating screen and a fine powder tank; the powder inlet of the cyclone separator is sealedly connected to the powder outlet of the powder outlet pipe; the powder inlet at the top of the vibrating screen is sealedly connected to the powder outlet at the bottom of the cyclone separator; the powder inlet at the top of the fine powder tank is sealedly connected to the powder outlet at the bottom of the vibrating screen.
[0016] Compared with the prior art, the friction reduction device of the air flow mill discharge of the utility model has the following beneficial effects: the solution can well overcome the problems in the prior art that the inner wall of the plastic steel wire tube is severely eroded and worn, the steel wire of the steel wire tube and the worn debris of the plastic inner wall are mixed in the powder and enter the powder, causing harmful factors such as sand holes and impurities in the powder, and at the same time, the risk of powder ignition caused by the wear of the steel wire tube, thinning of the tube wall or even leakage, and the trouble of regular inspection and replacement of the discharge steel wire tube. In addition, since nitrogen inlet holes and outlet holes and capillaries connected thereto are provided in the tube wall of the A and A section discharge tubes, the powder residues remaining between the outer wall of the B section discharge tube and the inner wall of the plastic steel wire tube can be blown into the C section discharge tube along the gap between the outer wall of the B section discharge tube and the inner wall of the C section discharge tube, and blown away along the powder discharge tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall layout of the airflow milling equipment according to one embodiment of the utility model;
[0018] Figure 2 It is a schematic structural diagram of a friction reducing device according to one embodiment of the utility model.
[0019] Description of main reference numerals:
[0020] 1-medium powder tank, 2-feeder, 3-discharging wire pipe, 4-grinding chamber, 5-first flange, 501-section A discharge pipe, 502-section B discharge pipe, 6-discharging wire pipe, 7-second flange, 701-section C discharge pipe, 8-pipe clamp, 9-powder discharge pipe, 10-cyclone separator, 11-vibrating screen, 12-fine powder tank, 13-inlet quick-release connector, 14-air outlet, 15-capillary tube. DETAILED DESCRIPTION
[0021] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.
[0022] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.
[0023] like Figure 1 to Figure 2 As shown, according to a preferred embodiment of the utility model, a friction reducing device for airflow mill discharge is used for airflow mill powder making equipment, and the friction reducing device comprises a first flange 5, a second flange 7 and a discharge wire pipe 6; one end of the first flange 5 is sealed and connected with the discharge flange of the grinding chamber 4 of the airflow mill powder making equipment, and the other end of the first flange 5 is provided with a section A discharge pipe 501 and a section B discharge pipe 502 in sequence, and the outer diameter of the section B discharge pipe 502 is smaller than the outer diameter of the section A discharge pipe 501; one end of the second flange 7 is sealed and connected with the feed flange of the powder discharge pipe 9 of the airflow mill powder making equipment, and the other end of the second flange 7 is provided with a section C discharge pipe 701, and the inner diameter of the section C discharge pipe 701 is larger than the outer diameter of the section B discharge pipe 502, so that the section B discharge pipe 502 can penetrate into the interior of the section C discharge pipe 701; the two ends of the discharge wire pipe 6 are respectively sleeved on the outer diameters of the section A discharge pipe 501 and the section C discharge pipe 701.
[0024] In some embodiments, since the inner diameter of the C-section discharge pipe 701 is larger than the outer diameter of the B-section discharge pipe 502, no matter the discharge end of the B-section discharge pipe 502 is close to the feed end of the C-section discharge pipe 701, or the discharge end of the B-section discharge pipe 502 is deep inside the feed end of the C-section discharge pipe 701, most of the powders with qualified particle sizes will no longer wash and wear the inner wall of the discharge wire pipe 6 during the discharge process. Moreover, there is still a small gap between the discharge end of the B-section discharge pipe 502 and the feed end of the C-section discharge pipe 701, or between the outer wall of the B-section discharge pipe 502 and the C-section discharge pipe 701, which is conducive to the subsequent purging of residual powder.
[0025] In some embodiments, the first flange 5 also includes a plurality of air vents 14, which are parallel to the central axis of the section A discharge pipe 501 and evenly distributed inside the tube wall of the section A discharge pipe 501, and the outlets of the plurality of air vents 14 are located at the end face of the section A discharge pipe 501 and outside the outer wall of the section B discharge pipe 502.
[0026] In some embodiments, the first flange 5 also includes multiple air inlet holes, the central axis of which intersects vertically with the central axis of the section A discharge pipe 501, and is evenly distributed on the outer wall of the section A discharge pipe 501, and each air inlet hole is connected to an air outlet hole 14.
[0027] In some embodiments, the friction reduction device for the air flow mill discharge also includes a capillary 15, which is arranged between the end face of the section A discharge pipe 501 and the end face of the section C discharge pipe 701, and is located between the inner wall of the discharge wire tube 6 and the outer wall of the section B discharge pipe 502. One end of the capillary 15 is sealed and connected to the outlet of the air outlet 14, and the other end is located near the end face of the section C discharge pipe 701.
[0028] In some embodiments, the other end of some capillaries 15 has an elbow. The elbow faces the outer wall of the B-section discharge pipe 502, the end face of the A-section discharge pipe 501, or the inner wall of the discharge wire pipe 6. That is to say, the gas outlet of the capillary 15 faces the end face of the C-section discharge pipe 701, the outer wall of the B-section discharge pipe 502, the inner wall of the discharge wire pipe 6, and the end face of the A-section discharge pipe 501. This arrangement is more conducive to cleaning the powder remaining between the outer wall of the B-section discharge pipe 502 and the inner wall of the discharge wire pipe 6.
[0029] In some embodiments, the friction reduction device for the jet mill output also includes an air intake quick-release connector 13, one end of which is sealed on the inlet of the air intake hole, and the other end of the air intake quick-release connector 13 is used to connect to a nitrogen source.
[0030] In some embodiments, the friction reduction device of the air flow mill discharge also includes a pipe clamp 8, which is arranged on the outer walls of the two ends of the discharge steel wire pipe 6, and the pipe clamp 8 is used to seal and fix the discharge steel wire pipe 6 with the A section discharge pipe 501 and the C section discharge pipe 701.
[0031] In some embodiments, the air flow grinding equipment also includes a feed wire tube 3, a feeder 2 and a medium powder tank 1; the lower end of the feed wire tube 3 is sealed connected to the feed port of the grinding chamber 4; the lower discharge port of the feeder 2 is sealed connected to the upper end of the feed wire tube 3; and the lower discharge port of the medium powder tank 1 is sealed connected to the feed port of the feeder 2.
[0032] In some embodiments, the airflow grinding equipment also includes a cyclone separator 10, a vibrating screen 11 and a fine powder tank 12; the powder inlet of the cyclone separator 10 is sealedly connected to the powder outlet of the powder outlet pipe 9; the powder inlet at the top of the vibrating screen 11 is sealedly connected to the powder outlet at the bottom of the cyclone separator 10; the powder inlet at the top of the fine powder tank 12 is sealedly connected to the powder outlet at the bottom of the vibrating screen 11.
[0033] In some embodiments, the airflow milling process of the airflow milling device of the utility model is as follows: the hydrogen-crushed powder in the medium powder tank 1 is transported by the feeder 2 and enters the grinding chamber 4 through the discharge wire pipe 3. The hydrogen-crushed powder is ground in the grinding chamber 4 to a suitable particle size and then discharged from the discharge port of the grinding chamber 4 after being sorted. The sorted powder is discharged from the discharge port of the grinding chamber 4 through the A-section discharge pipe 501, the B-section discharge pipe 502 inside the first flange 5 and the discharge wire pipe 6, the C-section discharge pipe 701 of the second flange 7, and the powder discharge pipe 9 under the action of the airflow, and enters the cyclone separator 10. After separation by the separator, the powder with the qualified particle size is collected in the fine powder tank 12 through the vibrating screen 11. After one tank of powder is made, it is processed and transferred to the next process. Figure 2 As shown in the structure, at the discharge port of the grinding chamber 4, a quick-connect connector is installed in the radial direction of the discharge pipe 501 of the A section of the first flange 5 for connecting nitrogen, and a hole is punched in the axial direction of the discharge pipe 501 of the A section to form an outlet hole 14 connected to the quick-connect connector. The capillary 15 is welded and fixed to the outlet hole 14 as shown in the figure. The edge of the discharge pipe 502 of the B section of the first flange 5 coincides with or is slightly inserted into the edge of the discharge pipe 701 of the C section of the second flange 7. The outer surface of the discharge pipe 502 of the B section of the first flange 5 is polished to a mirror finish. The discharge wire tube 6 is sleeved on the discharge pipe 501 of the A section of the first flange 55 and the second flange 7, and clamped with pipe clamp 8 to ensure airtight sealing. When making powder, powder flows out from grinding chamber 4 after sorting, enters into C-section discharge pipe 701 and powder discharge pipe 9 through discharge pipe 501 and discharge pipe 502 of A section of first flange 5, and will not cause wear to discharge steel wire pipe 6. After powder making is completed, powder will remain in the gap between discharge pipe 502 of B section of first flange 5 and discharge steel wire pipe 6, that is, on the surface of outer wall of discharge pipe 502 of B section. At this time, open valve to allow nitrogen to enter from quick connector and blow out from outlet of capillary 15 to clean the residual powder in the gap.
[0034] In summary, the friction reduction device of the air flow mill discharge of the utility model has the following beneficial effects: the scheme can well overcome the problem that the inner wall of the plastic steel wire tube is severely eroded and worn in the prior art, and the debris of the steel wire of the steel wire tube and the worn plastic inner wall are mixed in the powder and enter the powder, causing harmful factors such as sand holes and impurities in the powder. At the same time, the risk of powder ignition caused by the wear of the steel wire tube, thinning of the tube wall or even leakage, and the trouble of regular inspection and replacement of the discharge steel wire tube. In addition, since nitrogen inlet holes and outlet holes and capillaries connected thereto are set in the tube wall of the A and A section discharge tubes, the powder residues remaining between the outer wall of the B section discharge tube and the inner wall of the plastic steel wire tube can be blown into the C section discharge tube along the gap between the outer wall of the B section discharge tube and the inner wall of the C section discharge tube, and blown away along the powder discharge tube, thus avoiding the risk of fire caused by powder residues and reducing the waste of powder of suitable particle size.
[0035] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.
Claims
1. A device for reducing friction of jet mill discharge, which is used in jet mill powder making equipment, characterized in that: The friction reducing device comprises: A first flange, one end of which is sealed and connected to the discharge flange of the grinding chamber of the airflow milling equipment, and the other end of the first flange is provided with a section A discharge pipe and a section B discharge pipe in sequence, and the outer diameter of the section B discharge pipe is smaller than the outer diameter of the section A discharge pipe; a second flange, one end of which is sealed and butted with a feed flange of a powder discharge pipe of the airflow grinding device, and the other end of the second flange is provided with a C-section discharge pipe, the inner diameter of the C-section discharge pipe being larger than the outer diameter of the B-section discharge pipe, so that the B-section discharge pipe can be inserted into the interior of the C-section discharge pipe; and The two ends of the discharge wire pipe are respectively sleeved on the outer diameters of the A-section discharge pipe and the C-section discharge pipe.
2. The device for reducing friction of jet mill discharge as claimed in claim 1, characterized in that: The first flange also includes a plurality of air outlet holes, which are arranged parallel to the central axis of the section A discharge pipe and evenly distributed inside the tube wall of the section A discharge pipe. The outlets of the plurality of air outlet holes are located at the end face of the section A discharge pipe and outside the outer wall of the section B discharge pipe.
3. The friction reducing device for jet mill discharge as claimed in claim 2, characterized in that: The first flange also includes a plurality of air inlet holes, the axis of which intersects perpendicularly with the central axis of the A-section discharge pipe and is evenly distributed on the outer wall of the A-section discharge pipe, and each of the air inlet holes is connected to one of the air outlet holes.
4. The friction reducing device for jet mill discharge as claimed in claim 2, characterized in that: It also includes a capillary tube, which is arranged between the end face of the A section discharge pipe and the end face of the C section discharge pipe, and is located between the inner wall of the discharge wire tube and the outer wall of the B section discharge pipe. One end of the capillary tube is sealed and connected to the outlet of the air vent, and the other end is located near the end face of the C section discharge pipe.
5. The friction reducing device for jet mill discharge as claimed in claim 4, characterized in that: The other end of the capillary tube has an elbow.
6. The device for reducing friction of jet mill discharge as claimed in claim 5, characterized in that: The elbow faces the outer wall of the B-section discharge pipe, the end face of the A-section discharge pipe or the inner wall of the discharge steel wire pipe.
7. The friction reducing device for jet mill discharge as claimed in claim 3, characterized in that: It also includes an air intake quick-release connector, one end of which is sealingly arranged on the inlet of the air intake hole, and the other end of the air intake quick-release connector is used to connect to a nitrogen source.
8. The friction reducing device for jet mill discharge as claimed in claim 1, characterized in that: It also includes a pipe clamp, which is arranged on the outer walls of both ends of the discharge steel wire pipe, and the pipe clamp is used to seal and fix the discharge steel wire pipe with the A-section discharge pipe and the C-section discharge pipe.
9. The device for reducing friction of jet mill discharge as claimed in claim 1, characterized in that: The airflow milling equipment also includes: A feeding wire tube, the lower end of which is sealed and connected to the feeding port of the grinding chamber; A feeder, the lower discharge port of which is sealed and connected to the upper end of the feed wire tube; and The middle powder tank has a lower discharge port which is sealedly connected to the feed port of the feeder.
10. The device for reducing friction of jet mill discharge as claimed in claim 1, characterized in that: The airflow milling equipment also includes: A cyclone separator, whose powder inlet is sealedly connected to the powder outlet of the powder outlet pipe; A vibrating screen, the powder inlet at the top of which is sealedly connected to the powder outlet at the bottom of the cyclone separator; and The fine powder tank has a powder inlet at the top thereof which is sealedly connected to a powder outlet at the bottom of the vibrating screen.