EP3441144B1

EP3441144B1 - Stirring-type grinding separator and grinding device

Info

Publication number: EP3441144B1
Application number: EP16901222.6A
Authority: EP
Inventors: Tianyi ZHAN
Original assignee: Boyee (shenzhen) Industrial Technology Co Ltd
Current assignee: Boyee (shenzhen) Industrial Technology Co Ltd
Priority date: 2016-05-09
Filing date: 2016-05-09
Publication date: 2023-10-11
Anticipated expiration: 2036-05-09
Also published as: WO2017193267A1; EP3441144A1; HUE064931T2; EP3441144A4; ES2963544T3

Description

TECHNICAL FIELD

The invention relates to the technical field of grinding, in particular to a grinding device comprising a stirring-type grinding separator.

BACKGROUND OF THE INVENTION

When existing grinding devices work, ground materials are separated from non-ground materials and grinding balls under the effect of high-speed rotation of the separators; however, due to the fact that the separators cannot achieve material layering, materials with various sizes are all gathered around the separators, and consequentially, the ground materials cannot be effectively discharged out of the separators, and the separation effect is affected.
Document EP 2 857 105 A1 relates to a filtering centrifuge of the field of solid-liquid separation, the centrifuge including a screw discharger. An example of a grinding device comprising a separator is disclosed in EP 2036613 A2 .

BRIEF SUMMARY OF THE INVENTION

The main technical issue to be settled by the invention is to provide a grinding device comprising a stirring-type grinding separator. The stirring-type grinding separator can layer materials in the separator according to particle sizes, so that material accumulation around the separator is avoided, thus, improving the separation efficiency.
The invention provides a grinding device. The grinding device comprises a stirring-type grinding separator. The stirring-type grinding separator comprises a separation cover and a separation impeller coaxial with the separation cover. A spiral separator is disposed in the separation cover and has an end connected with the separation impeller and an end matched with a through hole in the separation cover.
Furthermore, a plurality of blades are evenly distributed on an edge of the separation impeller, and a channel is formed between every two adjacent blades.
Furthermore, the spiral separator is conical and has a small end located inside the separation cover. The spiral separation groove is formed in the outer surface of the conical spiral separator and has two ends respectively communicated with a feeding channel of the separation impeller and the through hole.
Furthermore, the number of the blades is 3-12.
Furthermore, gaps allowing media to move therein are formed between the blades and the outer surface of the spiral separator.
Furthermore, the separation impeller and the separation cover are cylindrical.
Furthermore, the separation cover is provided with a separation cavity matched with the spiral separator. The through hole is formed in the outer end face of the separation cover and is communicated with the separation cavity. An annular step is disposed around the through hole.
Furthermore, the section of the spiral groove can be square, trapezoidal, semi-circular or C-shaped.
Furthermore, the spiral separator is provided with a fixing hole to be connected with a separation rotating shaft. The separation rotating shaft comprises discharging channel shaft and a solid shaft, wherein the discharging channel shaft is provided with a blind hole, the solid shaft is located in the fixing hole, the discharging channel hole is located outside the separation cover, and the blind hole of the discharging channel shaft is provided with at least one guide hole through which the blind hole is communicated with the separation cavity or the spiral groove.
Furthermore, when the number of the guide holes is two, the included angle between the two guide holes is 30°-60°.
Furthermore, the separation cavity is conical and has a small-area end located on the inner side of the separation cover.
Furthermore, through hole communicates with the conical separation cavity.
Furthermore, a plurality of blades are evenly distributed on the edge of the separation impeller, and a channel is formed between every two adjacent blades.
Furthermore, the number of the blades is 3-12.
Furthermore, the separation impeller and the separation cover are cylindrical.
Furthermore, the spiral separator is provided with a fixing hole to be connected with a separation rotating shaft. The separation rotating shaft comprises a discharging channel shaft and a solid shaft, wherein the discharging channel shaft is provided with a blind hole and located outside the separation cover, and the solid shaft is located in the fixing hole. The blind hole of the discharging channel shaft is provided with at least one guide hole through which the blind hole and the separation cavity or the spiral groove are communicated.
Furthermore, when the number of the guide holes is two, the included angle between the two guide holes is 30°-60°.
Furthermore, the section of the spiral groove can be square, trapezoidal, semi-circular or C-shaped.
Furthermore, the through hole is formed in the outer end face of the separation cover and is communicated with the separation cavity. An annular step is disposed around the through hole.
The grinding separator comprises the separation cover and the separation impeller coaxial with the separation cover. The spiral separator is disposed in the separation cover and has an end connected with the separation impeller and an end matched with the through hole in the separation cover. In work, the separation rotating shaft is driven by a motor to rotate at a high speed, a negative pressure is formed in the separation cover under the effect of the separation impeller, and materials enter the spiral groove via the channels between the blades and are distributed, under the effect of a centrifugal force generated by the spiral separator, by mass or by diameter in a manner that the mass of the materials is gradually decreased from the bottom to the end of the spiral groove, that is to say, small-mass or small-diameter materials are located at the end of the spiral groove, large-mass or large-diameter materials are located at the bottom of the spiral groove; and at the same time, the materials are pushed to move towards the discharging channel from the spiral groove, and when transferred to an outlet of a separation channel under the effect of the spiral groove, the materials are separated and discharged. As the negative pressure is generated in the separation cover under the high-speed rotation of the separation impeller, separable materials are screened out to enter the separation cover, the situation that large materials and small materials are gathered at a separation port at the same time is avoided, and thus, the material discharging efficiency and speed are improved, and the technical effect of grinding efficiency improvement is achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the technical solution of embodiments of the invention or the prior art more clearly, a brief introduction of drawings needed for the description of the embodiments or the prior art is given as follows. Apparently, the drawings in the following description are only for certain embodiments of the invention. For those ordinarily skilled in this field, other drawings can be obtained according to these drawings without creative work.

FIG. 1 is an assembled structural view of a grinding separator in one embodiment.
FIG. 2 is an assembled structural view of a separation impeller and a spiral separator in one embodiment.
FIG. 3 is a cross-sectional structural view of the grinding separator along the central axis.
FIG. 4 is an assembled structural view of the separation impeller and the spiral separator in a second embodiment.
FIG. 5 is a cross-sectional structural view of the grinding separator along the central axis in the second embodiment.
FIG. 6 is an assembled structural view of the separation impeller and the spiral separator in a third embodiment.
FIG. 7 is a cross-sectional structural view of the grinding separator along the central axis in the third embodiment.

The implementations, functional characteristics and advantages of the invention are further described as follows in combination with the embodiments and accompanying drawings.

DETAILED DESCRIPTION OF THE INVENTION

To make the objectives, technical solutions and advantages of the invention clearer, a clear and complete description of the technical solutions of embodiments of the invention is given as follows with reference to the accompanying drawings in the embodiments. Apparently, the embodiments in the following description are only some illustrative ones and do not include all possible embodiments of the invention. All other embodiments obtained by those ordinarily skilled in this field based on these embodiments without creative work should fall within the protection scope of the invention.
As shown in FIGs. 1-3, the invention provides one embodiment of a grinding device comprising a stirring-type grinding separator.
The stirring-type grinding separator comprises a separation cover 1 and a separation impeller 2 coaxial with the separation cover 1. A spiral separator 3 is disposed in the separation cover 1 and has an end connected with the separation impeller 2 and an end matched with a through hole 10 in the separation cover 1.
Particularly, the separation impeller 2 is cylindrical, and the separation cover 1 is also cylindrical. A plurality of blades 22 are evenly distributed on an edge of the separation impeller 2. A channel 21 is disposed between every two adjacent blades 22. When the separation impeller 2 rotates at a high speed, a negative pressure is formed in the separation cover 1, and in this case, materials can enter the separation cover 1 only through the channels 21 between the blades 22. The number of the blades 22 can be 3-12 as needed, and the invention has no limitation in this regard. Gaps 23 allowing media to move therein are formed between the blades 22 and the outer surface of the bottom of the spiral separator 3. Materials can smoothly enter a spiral groove 32 on the spiral separator 3 via the gaps 23.
The spiral groove 32 spirally rises to the end of the spiral separator 3 from the bottom of the outer surface of the separator 3, and the spiral angle of the spiral groove 32 is at least 360°. The separation cover 1 is provided with a cavity used for accommodating the spiral separator 3. When the spiral separator 3 is matched with the separation cover 1, the spiral groove 32 forms an airtight channel; in the separation process, materials move along the airtight channel formed between the spiral groove 32 and the cavity of the separation cover, and the situation that materials directly enter two adjacent spiral sections of the spiral grooves 32, and consequentially, materials with large size differences are gathered at the same position, and the separation effect is affected is avoided. An end face, matched with a separation rotating shaft 4, of the separation cover 1 is provided with the through hole 10 communicated with the cavity.
The through hole 10 is communicated with an opening of the spiral groove 32. An annular step 11 is disposed around the through hole 10. Materials can leave a separation cavity (not shown) and enter a discharging channel to be discharged via the through hole 10. The annular step 11 is structurally matched with the separation rotating shaft 4, so that the airtightness between the separation rotating shaft 4 and the separation cover 1 is improved.
The spiral separator 3 is provided with a fixing hole 30 to be connected with the separation rotating shaft 4. The separation rotating shaft 4 comprises a hollow shaft 40 and a solid shaft 41, wherein the hollow shaft 40 is provided with a blind hole 43 and located outside the separation cover 1, and the solid shaft 41 is located in the fixing hole 30. The separation impeller 2, the spiral separator 3 and the separation cover 1 can be fixed together through the separation rotating shaft 4. The blind hole 43 serves as one part of a discharging channel and has an end face provided with two guide holes 42 through which the blind hole 43 and the separation cavity are communicated. The guide holes 42 preferably correspond to the spiral groove 32 in position so that materials can enter the discharging channel more smoothly. The included angle between the two guide holes 42 is 30°-60°.
The spiral groove 32 spirally rises so that materials can be separated by mass or diameter from outside to inside in the separation process. Meanwhile, the spiral groove is a slope so that materials can be pushed towards the discharging channel more easily in the separation process, and thus, the separation and discharging efficiency is improved.
In work, the separation rotating shaft 4 is driven by a motor to rotate at a high speed, a negative pressure is formed in the separation cover 1 under the effect of the separation impeller 2, and materials enter the spiral groove 32 via the channels 21 between the blades 22 and are distributed, under the effect of a centrifugal force generated by the spiral separator 3, by mass or diameter in a manner that the mass of the materials is gradually decreased from the bottom to the end of the spiral groove, that is to say, small-mass or small-diameter materials are located at the end of the spiral groove, and large-mass or large-diameter materials are located at the bottom of the spiral groove; and at the same time, the materials are pushed to move towards the discharging channel from the spiral groove, and when transferred to an outlet of a separation channel under the effect of the spiral groove, the materials are separated and discharged. As the negative pressure is generated in the separation cover under the high-speed rotation of the separation impeller 2, separable materials are screened out to enter the separation cover, the situation that large materials and small materials are gathered at a separation port at the same time is avoided, and thus, the material discharging efficiency and speed are improved, and the technical effect of grinding efficiency improvement is achieved.
An escape hole can be formed at a proper position of the separation cover 1 as needed and is located on the spiral groove 32. Large-mass or large-diameter materials entering the spiral groove 32 can be released through the escape hole, and thus, the separation effect is improved.
The invention has no special limitation on the structure of the spiral groove 32, and the section of the spiral groove 32 can be square, trapezoidal, semicircular or C-shaped. In order to ensure a small resistance during material separation, the spiral groove 32 is preferably of a semicircular or C-shaped structure.
As shown in FIG. 4 and FIG. 5, the invention further provides a second embodiment of the grinding device on the basis of the first embodiment.
The section, along the central axis, of the spiral separator 3 is in an inverted cone shape, that is to say, the spiral separator 3 has a conical top at the end connected with the separation impeller 2 and a conical bottom at the end matched with the separation rotating shaft 4. The cavity in the separation cover matched with the spiral separator 3 in such shape is structurally matched with the spiral separator 3, and after the cavity is matched with the spiral separator 3, the separation groove 32 forms an airtight pipeline structure with two ends respectively connected with one of the channels 21 between the blades 22 and one of the guide holes 42. The second embodiment is identical with the first embodiment in other structural aspects and the working principle and thus will not be described again.
As shown in FIG. 6 and FIG. 7, the invention further provides a third embodiment of the grinding device on the basis of the first embodiment.
The section, along the central axis, of the spiral separator 3 is cylindrical, that is to say, the spiral separator 3 has a conical top at the end connected with the separation impeller 2 and a conical bottom at the end matched with the separation rotating shaft 4. The cavity in the separation cover matched with the spiral separator 2 in such shape is structurally matched with the spiral separator 3, and after the cavity is matched with the spiral separator 3, the separation groove 32 forms an airtight pipeline structure with two ends respectively connected with one of the channels 21 between the blades 22 and one end of the guide holes 42. The third embodiment is identical with the first embodiment in other structural aspects and the working principle and thus will not be described again.
The invention further includes an embodiment of a stirring-type grinding separator.
The grinding separator comprises a separation impeller and a separation cover. A conical separation cavity is formed in the separation cover and has an open end matched with the separation impeller. The side wall of the separation cavity is provided with a spiral separation groove or a spiral separation step from outside to inside.
Particularly, the separation cavity of the separation cover is conical and has a small-area end located inside the separation cavity. A plurality of blades 22 are evenly distributed on an edge of the separation impeller 2. A channel 21 is formed between every two adjacent blades 22. When the separation impeller 2 rotates at a high speed, a negative pressure is formed in the separation cover, and in this case, materials can enter the separation cover 1 only through the channels 21 between the blades 22. The number of the blades 22 can be 3-12 as needed, and the invention has no limitation in this regard. Gaps allowing media to move therein are formed between the blades 22 and the outer surface of a spiral separator 3, and materials can smoothly enter the spiral groove 32 on the spiral separator 3 via the gaps.
The separation impeller 2 is cylindrical, and the separation cover is also cylindrical. The spiral groove 32 spirally rises from the bottom to the end of the spiral separator 2, and the spiral angle of the spiral groove 32 is at least 360°. An end face, matched with a separation rotating shaft 4, of the separation cover 1 is provided with a through hole 10 communicated with the cavity. An annular step 11 is disposed around the through hole 10. Materials can leave the separation cavity (not shown) and enter a discharging channel to be discharged via the through hole 10. The annular step 11 is structurally matched with the separation rotating shaft 4, and thus, the airtightness between the separation rotating shaft 4 and the separation cover 1 is improved.
The spiral separator 3 is provided with a fixing hole 30 to be connected with the separation rotating shaft 4. The separation rotating shaft 4 comprises a hollow shaft 40 and a solid shaft 41, wherein the hollow shaft 40 is provided with a blind hole 43 and located outside the separation cover 1, and the solid shaft 41 is located in the fixing hole 30. The separation impeller 2, the spiral separator 3 and the separation cover 1 can be fixed together through the separation rotating shaft 4. The blind hole 43 serves as one part of the discharging channel and has an end face provided with two guide holes 42 through which the blind hole 43 and the separation cavity are communicated. The guide holes 42 preferably correspond to the spiral groove 32 in position so that materials can enter the discharging channel more smoothly. The included angle between the two guide holes 42 is 30°-60°.
The spiral groove 32 spirally rises so that materials can be separated, by mass or diameter, from outside to inside in the separation process. Meanwhile, the spiral groove is a slope so that materials can be pushed towards the discharging channel more easily in the separation process, and thus, the separation and discharging efficiency is improved.
The above embodiments are only intended to explain the technical solutions of the invention rather than to limit the invention. Although the invention is detailed with reference to the above embodiments, those ordinarily skilled in this field would appreciate that modifications of the technical solutions recorded in the above embodiments or equivalent substitutions of part of the technical characteristics can still be made, provided they fall in the scope of the appended claims.

Claims

A grinding device, comprising a stirring-type grinding separator, wherein the stirring-type grinding separator comprises a separation cover (1) and a separation impeller (2) coaxial with the separation cover, and a spiral separator (3) is disposed in the separation cover and has an end connected with the separation impeller and an end matched with a through hole (10) in the separation cover.
The grinding device according to Claim 1, wherein a plurality of blades (22) are evenly distributed on an edge of the separation impeller, and a channel (21) is formed between every two adjacent said blades.
The grinding device according to one of Claims 1 and 2, wherein the spiral separator is conical and has a small end located inside the separation cover, and a spiral groove (32) is formed in an outer surface of the conical spiral separator and has two ends respectively communicated with a feeding channel of the separation impeller and the through hole.
The grinding device according to Claim 2, wherein gaps (23) allowing media to move therein are formed between the blades and an outer surface of the spiral separator.
The grinding device according to Claim 3, wherein the spiral separator is provided with a fixing hole (30) and connected with a separation rotating shaft (4) in the fixing hole, the separation rotating shaft comprises a hollow shaft (40) and a solid shaft (41) , the hollow shaft is provided with a blind hole (43) and located outside the separation cover, the solid shaft is located in the fixing hole, and the blind hole of the hollow shaft is provided with at least one guide hole (42) through which the blind hole and the spiral groove are communicated.
The grinding device according to Claim 5, wherein the separation cover is provided with a separation cavity matched with the spiral separator, the through hole is formed in an outer end face of the separation cover and is communicated with the separation cavity, and an annular step (11) is disposed around the through hole.
The grinding device according to Claim 5, wherein when the number of the guide holes is two, an included angle between the two guide holes is 30° to 60°.
The grinding device according to Claim 2, wherein the number of blades is 3 to 12.
The grinding device according to Claim 1, wherein the separation impeller and the separation cover are cylindrical.
The grinding device according to Claim 6, wherein the separation cavity is conical and has a small-area end located on an inner side of the separation cover.
The grinding device according to Claim 10, wherein the through-hole communicates with the conical separation cavity.