CN107913770B - Grinding device for preparing composite material for additive manufacturing bone scaffold - Google Patents
Grinding device for preparing composite material for additive manufacturing bone scaffold Download PDFInfo
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- CN107913770B CN107913770B CN201711406989.6A CN201711406989A CN107913770B CN 107913770 B CN107913770 B CN 107913770B CN 201711406989 A CN201711406989 A CN 201711406989A CN 107913770 B CN107913770 B CN 107913770B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a grinding device for preparing a composite material for an additive manufacturing bone support, wherein two ends of a grinding cylinder are rotatably arranged on a supporting seat, the supporting seat is supported at the top end of the support by an angle-adjustable assembly, a U-shaped fixing frame is fixedly arranged on the supporting seat, a rolling supporting assembly for rolling and supporting the grinding cylinder and driving the grinding cylinder to roll is arranged on the U-shaped fixing frame, the grinding cylinder rotates relative to the supporting seat under the driving and supporting of the rolling supporting assembly, and a high-frequency oscillation driving assembly is arranged between a base and the U-shaped fixing frame. When the semi-finished composite material is ground, the grinding cylinder is driven to rotate through the rolling support assembly and the high-frequency oscillation driving assembly, the grinding cylinder is made to oscillate up and down, the grinding efficiency of the composite material can be improved, the grinding thoroughness of the composite material is improved, effective grinding impact on the composite material is realized through the arrangement of the grinding balls with different sizes, the grinding performance is ensured, and the performance of the printing bone support can be greatly improved.
Description
Technical Field
The invention relates to a grinding device for preparing a composite material for an additive manufacturing bone scaffold, and belongs to the technical field of auxiliary equipment for preparing materials for additive manufacturing.
Background
Additive Manufacturing (AM), also known as 3D printing technology, uses discrete materials as raw materials, performs layering processing on a three-dimensional Computer Aided Design (CAD) model, and directly realizes that printing and forming of high-performance parts are completed in one step from the CAD model by inputting high-power energy to melt the materials for stacking and growing. Compared with the traditional material reducing manufacturing technology, the material increasing manufacturing technology is a novel manufacturing method for realizing layer-by-layer superposition from bottom to top and from small to big. The additive manufacturing technology does not need traditional tools, clamps and a plurality of processing procedures, and can rapidly manufacture high-performance parts with extremely complex structures, thereby realizing free manufacturing, solving the problem that the parts with complex structures are difficult to integrally form, greatly reducing the processing procedures and shortening the processing period.
Currently, with the continuous development of medical technology and the continuous application of additive manufacturing technology, more and more medical structures, especially bone scaffolds, are mostly printed by using additive manufacturing technology. For the additive manufacturing of the bone scaffold, the bone scaffold needs to be printed by adopting a special composite material, the performance of the composite material is directly related to the effect of a printed product, and the bone scaffold with the medical structure belongs to a high-precision product, so that the performance requirement of the bone scaffold on the composite material is extremely high. This places even greater demands on the production of composite materials. For the preparation of the composite material, the prepared semi-finished composite material needs to be ground in the preparation process so as to ensure the required fineness and the surface property of the particles.
Aiming at the problems, the invention provides a grinding device for preparing a composite material for an additive manufacturing bone scaffold, which can improve the performance requirement in the preparation process of the additive manufacturing composite material.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a composite material preparation grinding device for additive manufacturing of a bone support is characterized by comprising a base, a support, an angle-adjustable supporting component, a supporting seat, a grinding cylinder and a U-shaped fixing frame, wherein the support is fixedly arranged at two ends of the base, two ends of the grinding cylinder are rotatably arranged on the supporting seat through bearings relative to the supporting seat, the supporting seat is supported at the top end of the support through the angle-adjustable component, the U-shaped fixing frame is fixedly arranged on the supporting seat, a rolling supporting component for rolling and supporting the grinding cylinder and driving the grinding cylinder to roll is arranged on the U-shaped fixing frame, the grinding cylinder rotates relative to the supporting seat under the driving and supporting of the rolling supporting component, a high-frequency oscillation driving component is arranged between the base and the U-shaped fixing frame so as to realize oscillation driving of the supporting seat, the grinding cylinder is driven to rotate through the rolling supporting assembly and the high-frequency oscillation driving assembly, and meanwhile the grinding cylinder is made to oscillate up and down.
Further, as preferred, be provided with into discharge gate on the grinding vessel, be provided with big grinding ball and little grinding ball in the grinding vessel, the number of little grinding ball is two times of big grinding ball number, the diameter of big grinding ball is two times between the little grinding ball, the homogeneous body is even on the outer circumferential wall of big grinding ball and little grinding ball is provided with the arch of protrusion ball outer surface.
Further, as preferred, be provided with at least three fixed recess along its circumference array on the inner wall of grinding vessel, all fixedly on every fixed recess being provided with a baffle, the tip of baffle is provided with and stretches into fixed recess's fixed head, adopt the viscose agent or weld the setting together between fixed recess and the fixed head.
Further, as preferred, the roll supporting component includes two sets of supporting components and a set of drive assembly, drive assembly sets up between two sets of supporting components, every group the supporting component includes the supporting rollers that two symmetries set up, the grinding vessel support in on the supporting rollers, every supporting rollers adopts the wheel carrier to fix on the U type mount, drive assembly is including driving tooth one, driving tooth two and rack, driving tooth one fixed cover is established on the outer circumference of grinding vessel, driving tooth two adopts the rack sets up on the U type mount, driving tooth one with driving tooth two meshing transmission, driving tooth two is by setting up driving motor drive on the U type mount rotates, and then the drive the grinding vessel rotates.
Further, as preferred, the high-frequency oscillation drive assembly includes fixed even frame, the articulated frame of vibration and high-frequency oscillator, the lower extreme of fixed even frame is fixed on the base, the articulated setting in fixed even upper end of frame is in U type mount one end is served, the articulated setting in the other end of U type mount is served in the articulated frame of vibration, the other end of the articulated frame of vibration is connected on high-frequency oscillator's the output, high-frequency oscillator fixes on the base.
Further, as a preferred mode, when the grinding cylinder oscillates up and down, the included angle between the central axis of the grinding cylinder and the horizontal line ranges from-3 degrees to +3 degrees.
Further, as preferred, the angle-adjustable supporting component comprises a seat body, a rotary spherical hinge supporting tile, a leaning shoulder, a wear-resistant column, a limiting shoulder, a spring, a wear-resistant sleeve, an elastic adjusting pad and an end cover, blind holes are arranged at two ends of the seat body, the blind hole at one end is matched and inserted and fixed on the support, the blind hole at the other end is provided with the wear-resistant leaning shoulder, one end of the supporting seat is sleeved with the wear-resistant sleeve, the other end of the supporting seat is provided with a bearing seat for installing and supporting the end part of the grinding cylinder, the rotary spherical hinge supporting tile is arranged between the wear-resistant sleeve and the inner side wall of the blind hole, the rotary spherical hinge supporting tile comprises an outer ring tile and an inner ring tile, the outer circumference of the outer ring tile is in interference fit with the inner wall of the blind hole, the inner ring tile is in interference, the supporting seat stretches into the tip of blind hole is provided with and supports and lean on the groove, support to lean on the inslot to be provided with wear-resisting post, a tip of wear-resisting post is supported and is leaned on the setting to lean on the elastic adjustment who leans on the inslot bottom surface stacks up, the other end of wear-resisting post stretches out support to lean on to set up behind the groove to lean on to take on, be provided with on the wear-resisting post spacing shoulder, lie in on the supporting seat support to lean on the terminal surface portion of groove to be provided with spacing lid, spacing shoulder spacing in spacing covering, spacing shoulder with be provided with between the elastic adjustment pad the spring, the pedestal with still be provided with the end cover.
Further, preferably, the wear-resistant sleeve and the wear-resistant sleeve are connected together by a connecting key.
Further, preferably, a flexible sealing cover is further arranged outside the end cover, and two ends of the sealing cover are respectively fixed on the wear-resistant sleeve and the end cover.
Further, preferably, a plurality of elastic support columns which abut against the wear-resistant sleeve along the radial direction of the seat body are arranged on the seat body.
Compared with the prior art, the invention has the beneficial effects that:
when the semi-finished composite material is ground, the grinding cylinder is driven to rotate by the rolling support assembly and the high-frequency oscillation driving assembly, and simultaneously the grinding cylinder is oscillated up and down, so that the grinding efficiency of the composite material can be improved, the grinding thoroughness of the composite material is improved, effective grinding impact on the composite material is realized by arranging grinding balls with different sizes, and the grinding performance is ensured.
Drawings
FIG. 1 is a schematic view of a composite-material-preparation grinding device for additive manufacturing of a bone scaffold according to the present invention;
FIG. 2 is a schematic cross-sectional view at A-A of a composite-material-preparation grinding device for additive manufacturing of a bone scaffold according to the present invention;
FIG. 3 is a schematic cross-sectional view at B-B of a composite-material-preparation grinding device for an additive-manufactured bone scaffold according to the present invention;
FIG. 4 is a schematic view of an angularly adjustable support assembly of an abrasive device for composite material fabrication for additive manufacturing of bone scaffolds in accordance with the present invention;
FIG. 5 is a schematic cross-sectional structural view of a grinding ball of the grinding device for composite material preparation for additive manufacturing of a bone scaffold according to the present invention;
the grinding device comprises a base 1, a base 2, a support 3, an angle-adjustable supporting component 4, a supporting seat 5, a grinding cylinder 6, a material inlet and outlet 7, a supporting roller 8, a driving tooth I, a driving tooth II, a wheel carrier 10, a wheel carrier 11, a U-shaped fixing frame 12, a fixing connecting frame 13, an oscillating hinge frame 14, a high-frequency oscillator 15, a baffle plate 16, a fixing head 17, a large grinding ball 18, a small grinding ball 19, a rotating ball hinge supporting tile 20, a sealing cover 21, a leaning shoulder 22, a wear-resistant column 23, a limiting shoulder 24, a spring 25, a wear-resistant sleeve 26, a connecting key 27, an elastic adjusting pad 28, an end cover 29, an elastic support column 30 and a protrusion.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: a composite material preparation grinding device for additive manufacturing of a bone support is characterized by comprising a base 1, a support 2, an angle-adjustable supporting component 3, a supporting seat 4, a grinding cylinder 5 and a U-shaped fixing frame 11, wherein the support 2 is fixedly arranged at two ends of the base 1, two ends of the grinding cylinder 5 are rotatably arranged on the supporting seat 4 by adopting bearings relative to the supporting seat 4, the supporting seat 4 is supported and arranged at the top end of the support 2 by adopting the angle-adjustable component 3, the U-shaped fixing frame 11 is fixedly arranged on the supporting seat 4, a rolling supporting component for rolling and driving the grinding cylinder to roll is arranged on the U-shaped fixing frame 11, the grinding cylinder 5 rotates relative to the supporting seat under the driving and supporting of the rolling supporting component, and a high-frequency oscillation driving component is arranged between the base 1 and the U-shaped fixing frame, so as to realize the oscillation drive to the supporting seat, realize through roll supporting component and high frequency oscillation drive assembly carrying out rotation drive to the grinding barrel while making the grinding barrel carry out the up-and-down oscillation.
In this embodiment, as shown in fig. 1-3, the grinding cylinder is provided with a material inlet and a material outlet 6, the grinding cylinder is provided with large grinding balls 17 and small grinding balls 18, the number of the small grinding balls 18 is twice of the number of the large grinding balls, the diameter of the large grinding balls is twice of the diameter between the small grinding balls, as shown in fig. 5, and the outer circumferential walls of the large grinding balls and the small grinding balls are uniformly provided with protrusions 30 protruding the outer surfaces of the balls.
As shown in fig. 2-3, at least three fixing grooves are arranged on the inner wall of the grinding cylinder along the circumferential array thereof, a baffle plate 15 is fixedly arranged on each fixing groove, fixing heads 16 extending into the fixing grooves are arranged at the end parts of the baffle plates 15, and the fixing grooves and the fixing heads 16 are arranged together by using adhesive or welding.
In this embodiment, the supporting component that rolls includes two sets of supporting components and a set of drive assembly, drive assembly sets up between two sets of supporting components, every group the supporting component includes the supporting roller 7 that two symmetries set up, the grinding vessel support in on the supporting roller 7, every supporting roller adopts wheel carrier 10 to fix on the U type mount 11, drive assembly is including driving tooth one 8, driving tooth two 9 and rack, the fixed cover of driving tooth one 8 is established on the outer circumference of grinding vessel, driving tooth two 9 adopts the rack sets up on the U type mount 11, driving tooth one with driving tooth two meshing transmission, driving tooth two is by setting up driving motor drive rotation on the U type mount, and then the drive the grinding vessel rotates.
As shown in fig. 1, the high-frequency oscillation driving assembly includes a fixed connecting frame 12, an oscillation hinge frame 13 and a high-frequency oscillator 14, the lower end of the fixed connecting frame 12 is fixed on the base 1, the upper end of the fixed connecting frame 12 is hinged to one end of the U-shaped fixing frame 11, the other end of the U-shaped fixing frame 11 is hinged to one end of the oscillation hinge frame 13, the other end of the oscillation hinge frame 13 is connected to the output end of the high-frequency oscillator 14, and the high-frequency oscillator 14 is fixed on the base.
In a preferred embodiment, when the grinding cylinder oscillates up and down, the included angle between the central axis of the grinding cylinder and the horizontal line ranges from-3 ° to +3 °.
As shown in fig. 4, the angle-adjustable supporting assembly includes a base, a rotary spherical hinge supporting tile 19, a leaning shoulder 21, a wear-resistant column 22, a limiting shoulder 23, a spring 24, a wear-resistant sleeve 25, an elastic adjusting pad 27 and an end cover 28, wherein blind holes are arranged at both ends of the base, the blind hole at one end is matched and inserted and fixed on the bracket, the blind hole at the other end is provided with a wear-resistant leaning shoulder 21, one end of the supporting base 4 is sleeved with the wear-resistant sleeve 25, the other end of the supporting base 4 is provided with a bearing seat for installing and supporting the end of the grinding cylinder, the rotary spherical hinge supporting tile 19 is arranged between the wear-resistant sleeve 25 and the inner side wall of the blind hole, the rotary spherical hinge supporting tile 19 includes an outer ring tile and an inner ring tile, the outer circumference of the outer ring tile is interference fit on the inner wall of the blind hole, the inner ring tile is interference, the supporting seat stretches into the tip of blind hole is provided with and supports and lean on the groove, support and lean on the inslot to be provided with wear-resisting post 22, a tip of wear-resisting post 22 is supported and is leaned on the setting lean on the elastic adjustment pad 27 of inslot bottom surface, the other end of wear-resisting post 22 stretches out support and lean on the setting after leaning on the groove to lean on shoulder 21, be provided with on the wear-resisting post 22 spacing shoulder 23, lie in on the supporting seat the end face portion of leaning on the groove is provided with spacing lid, spacing shoulder limit 23 is located spacing is covered, spacing shoulder 23 with be provided with between the elastic adjustment pad spring 24, the pedestal with still be provided with the end cover that has high elasticity between the supporting seat.
Wherein, the wear-resisting cover is connected with the wear-resisting cover by a connecting key 26. And a soft sealing cover 20 is arranged outside the end cover, and two ends of the sealing cover are respectively fixed on the wear-resistant sleeve and the end cover. The base body is provided with a plurality of elastic ejection columns 29 which radially abut against the wear-resistant sleeve.
When the semi-finished composite material is ground, the grinding cylinder is driven to rotate by the rolling support assembly and the high-frequency oscillation driving assembly, and simultaneously the grinding cylinder is oscillated up and down, so that the grinding efficiency of the composite material can be improved, the grinding thoroughness is improved, effective grinding impact on the composite material is realized by arranging the grinding balls with different sizes, and the grinding performance is ensured.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A composite material preparation grinding device for additive manufacturing of a bone support is characterized by comprising a base, a support, an angle-adjustable supporting component, a supporting seat, a grinding cylinder and a U-shaped fixing frame, wherein the support is fixedly arranged at two ends of the base, two ends of the grinding cylinder are rotatably arranged on the supporting seat through bearings relative to the supporting seat, the supporting seat is supported at the top end of the support through the angle-adjustable component, the U-shaped fixing frame is fixedly arranged on the supporting seat, a rolling supporting component for rolling and supporting the grinding cylinder and driving the grinding cylinder to roll is arranged on the U-shaped fixing frame, the grinding cylinder rotates relative to the supporting seat under the driving and supporting of the rolling supporting component, a high-frequency oscillation driving component is arranged between the base and the U-shaped fixing frame so as to realize oscillation driving of the supporting seat, the grinding cylinder is driven to rotate through the rolling support assembly and the high-frequency oscillation driving assembly, and the grinding cylinder is made to oscillate up and down;
the high-frequency oscillation driving assembly comprises a fixed connecting frame, an oscillation hinge frame and a high-frequency oscillator, the lower end of the fixed connecting frame is fixed on the base, the upper end of the fixed connecting frame is hinged to one end of the U-shaped fixing frame, the other end of the U-shaped fixing frame is hinged to one end of the oscillation hinge frame, the other end of the oscillation hinge frame is connected to the output end of the high-frequency oscillator, and the high-frequency oscillator is fixed on the base;
the angle-adjustable supporting component comprises a base body, a rotary spherical hinge supporting tile, a leaning shoulder, a wear-resistant column, a limiting shoulder, a spring, a wear-resistant sleeve, an elastic adjusting pad and an end cover, blind holes are formed in two ends of the base body, the blind hole at one end is matched and spliced and fixed on a support, the blind hole at the other end is provided with a wear-resistant leaning shoulder, one end of the supporting seat is sleeved with the wear-resistant sleeve, the other end of the supporting seat is provided with a bearing seat for installing and supporting the end part of the grinding cylinder, the rotary spherical hinge supporting tile is arranged between the wear-resistant sleeve and the inner side wall of the blind hole and comprises an outer ring tile and an inner ring tile, the outer circumference of the outer ring tile is in interference fit with the inner wall of the blind hole, the inner ring tile is in interference fit with the outer circumference of the wear-resistant sleeve, the tiltable angle between the, the support is leaned on and is provided with wear-resisting post to the inslot, a tip of wear-resisting post is leaned on the setting and is in lean on the elastic adjustment who leans on the inslot bottom surface stacks up, the other end of wear-resisting post stretches out lean on the setting after leaning on the groove and lean on to lean on shouldering, be provided with on the wear-resisting post spacing shoulder, lie in on the supporting seat lean on the terminal surface portion of groove to be provided with spacing lid, spacing shoulder spacing in spacing is covered, spacing shoulder with be provided with between the elastic adjustment pad the spring, the pedestal with still be provided with the end cover that has high elasticity between the supporting seat.
2. The composite material preparation milling device for additive manufacturing of bone scaffolds according to claim 1, wherein: be provided with into discharge gate on the grinding vessel, be provided with big grinding ball and little grinding ball in the grinding vessel, the number of little grinding ball is two times of big grinding ball number, the diameter of big grinding ball is two times of little grinding ball diameter, the even arch that is provided with the salient ball outer surface of homogeneous body on the outer circumferential wall of big grinding ball and little grinding ball.
3. The composite material preparation milling device for additive manufacturing of bone scaffolds according to claim 2, wherein: the grinding cylinder is characterized in that at least three fixing grooves are formed in the inner wall of the grinding cylinder along the circumferential array of the grinding cylinder, a baffle is fixedly arranged on each fixing groove, the end portion of each baffle is provided with a fixing head extending into the corresponding fixing groove, and the fixing grooves and the fixing heads are arranged together in a gluing mode through gluing agents or welding.
4. The composite material preparation milling device for additive manufacturing of bone scaffolds according to claim 3, wherein: the rolling supporting component comprises two groups of supporting components and a group of driving components, the driving components are arranged between the two groups of supporting components, each group of supporting components comprises two supporting rollers which are symmetrically arranged, the grinding cylinder is supported on the supporting rollers, each supporting roller adopts a wheel carrier to be fixed on the U-shaped fixing frame, the driving components comprise a driving tooth I, a driving tooth II and a tooth frame, the driving tooth I is fixedly sleeved on the outer circumference of the grinding cylinder, the driving tooth II is arranged on the tooth frame, the driving tooth I is meshed with the driving tooth II in a transmission mode, the driving tooth II is driven by a driving motor arranged on the U-shaped fixing frame to rotate, and then the grinding cylinder is driven to rotate.
5. The composite material preparation milling device for additive manufacturing of bone scaffolds according to claim 1, wherein: the wear-resistant sleeve and the supporting seat are connected together by a connecting key.
6. The composite material preparation milling device for additive manufacturing of bone scaffolds according to claim 1, wherein: the outer part of the end cover is also provided with a soft sealing cover, and two ends of the sealing cover are respectively fixed on the wear-resistant sleeve and the end cover.
7. The composite material preparation milling device for additive manufacturing of bone scaffolds according to claim 1, wherein: the seat body is provided with a plurality of elastic ejection columns which radially abut against the wear-resistant sleeve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711406989.6A CN107913770B (en) | 2017-12-22 | 2017-12-22 | Grinding device for preparing composite material for additive manufacturing bone scaffold |
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| CN201711406989.6A CN107913770B (en) | 2017-12-22 | 2017-12-22 | Grinding device for preparing composite material for additive manufacturing bone scaffold |
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| CN107913770B true CN107913770B (en) | 2020-04-03 |
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| CN112536098B (en) * | 2020-11-27 | 2022-02-25 | 渭南职业技术学院 | Blowing device that accurate pottery 3D printer was used |
| CN114260065B (en) * | 2021-11-15 | 2022-11-18 | 新沂市锡沂高新材料产业技术研究院有限公司 | Fine grinding and crushing device for laboratory |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201431907Y (en) * | 2009-03-27 | 2010-03-31 | 高德金 | Energy-saving vibration type ball grinder |
| CN202238185U (en) * | 2011-09-26 | 2012-05-30 | 栾义 | Drum-type powder rod mill |
| CN102809008A (en) * | 2012-08-29 | 2012-12-05 | 河南工业大学 | Spherical hinge type pneumatic conveying pipeline connecting joint |
| CN103406258B (en) * | 2013-09-02 | 2016-06-15 | 长沙矿冶研究院有限责任公司 | A kind of high frequency shale shaker |
| CN203526149U (en) * | 2013-09-27 | 2014-04-09 | 王若涵 | Novel anti-sticking wall roller device |
| CN203830078U (en) * | 2014-05-08 | 2014-09-17 | 浙江工业大学之江学院 | Ball mill with combination of shock excitation and rotation |
| CN204587307U (en) * | 2015-04-30 | 2015-08-26 | 杨勇生 | Electromagnetism flying disc |
| CN204816707U (en) * | 2015-07-22 | 2015-12-02 | 青岛世纳机械设备有限公司 | Hard material grinds special ball mill |
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