CN110898944A

CN110898944A - Annular gap grinding device

Info

Publication number: CN110898944A
Application number: CN201911081520.9A
Authority: CN
Inventors: 谢镭; 雷粤; 雷立猛; 尼佐利·密尔科
Original assignee: Puhler (guangdong) Smart Nano Technology Co Ltd
Current assignee: Puhler (guangdong) Smart Nano Technology Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-03-24

Abstract

The invention relates to an annular gap grinding device, in particular to an annular gap grinding device capable of being used for a sand mill, which comprises a grinding barrel vertically arranged and a grinding rotor extending into the grinding barrel and driven to rotate by a main shaft, wherein an annular gap is formed between the grinding barrel and the grinding rotor, a material and a grinding medium respectively enter the annular gap from a feed inlet and a medium inlet which are arranged at the upper end of the grinding barrel, and the material flows to a separator arranged at a discharge outlet at the bottom end of the grinding barrel after being ground by the grinding medium and the rotating grinding rotor and then flows out after being separated by the separator. The invention adopts the modes of bottom end feeding, grinding medium and bottom end discharging, and can ensure that the materials are fully ground in the annular gap; meanwhile, the grinding media and the materials can be quickly focused near the separator at the low end under the dual actions of self gravity and discharge pressure, so that the discharge efficiency can be improved, and the grinding media and the materials can not be gathered near the main shaft to avoid abrasion of the main shaft, thereby prolonging the service life of the main shaft.

Description

Annular gap grinding device

Technical Field

The invention relates to a grinding rotor of a sand mill.

Background

With the development of industrialization, the grinding quality of the sand mill is higher and higher. The sand mill is updated continuously and is made to appear like a hundred flowers at the same time, and various types are appeared. Such as a vertical sand mill, a horizontal sand mill, a straight cylinder sand mill or a conical cylinder sand mill, etc. The traditional sand mill generally feeds materials through mechanical seal, after the materials are stirred and ground at a high speed by a rotor and a grinding medium, the grinding medium and slurry are filtered by a separator, and the materials are discharged through a flange end cover of a grinding barrel. The traditional sand mill has the following defects:

1. when the grinding media and slurry are filtered through the separator, there is a plugging near the separator, even at the discharge outlet, due to some of the more viscous slurry.

2. After the general rotor is vertically installed and used, grinding media and slurry are easy to accumulate on a gland of the rotor, and the more the grinding media and the slurry are accumulated at the position closer to the shaft center, so that the grinding media continuously abrade the rotor shaft and the loss of the rotor shaft is continuously increased after the rotor is used for a long time.

Disclosure of Invention

Aiming at the problems, the invention provides the annular gap grinding device which has higher discharging efficiency and can avoid material blockage.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an annular gap grinder, includes the grinding barrel of vertical setting and stretches into this grinding barrel and drive rotatory grinding rotor by the main shaft, be formed with annular gap between grinding barrel and the grinding rotor, material and grinding medium get into from feed inlet and the medium entry that sets up in the grinding barrel upper end respectively annular gap, the material flows to the separator that sets up at grinding barrel bottom discharge gate after grinding medium and rotatory grinding rotor grind, flows out after this separator separation again.

Preferably, the grinding barrel comprises a barrel body forming the annular gap with the grinding rotor and an end cover arranged at the top end of the barrel body and sealing the barrel body, the top end of the end cover is provided with the feed inlet, and the side wall of the end cover is horizontally provided with the medium inlet.

Preferably, the grinding rotor includes a rotating body driven by the spindle, a shaft hole for mounting the spindle is axially formed in a center of the rotating body, an annular cavity is formed in an upper portion of the rotating body, a top cover for sealing the annular cavity is disposed at a top end of the rotating body, and a groove is formed in an end surface of a lower portion of the rotating body.

Preferably, the separator is provided in the groove.

Preferably, the grinding barrel further comprises an outer barrel sleeved outside the barrel body and hermetically connected with the barrel body through a flange, a separation cavity is formed between the outer barrel and the barrel body, and cooling liquid or hot fluid can be introduced into the separation cavity and the annular cavity.

Preferably, the bottom of the outer barrel is hermetically connected with a cover plate, and a material pipe communicated with the inner cavity of the separator is arranged on the cover plate.

Preferably, the bottom of the groove is provided with a bottom cover which can be connected with the spindle bolt, and the bottom cover is provided with a stirring blade.

Preferably, the annular gap is tapered.

Preferably, the cover plate is provided with an opening for introducing cooling liquid or hot fluid into the separation cavity, and the side wall of the upper end of the outer barrel is provided with an outlet for allowing the cooling liquid or the hot fluid to flow out.

According to the technical scheme, the mode of feeding and grinding media at the bottom end and discharging at the bottom end is adopted, so that the materials can be fully ground in the annular gap; meanwhile, the grinding media and the materials can be quickly focused near the separator at the low end under the dual actions of self gravity and discharge pressure, so that the discharge efficiency can be improved, and the grinding media and the materials can not be gathered near the main shaft to avoid abrasion of the main shaft, thereby prolonging the service life of the main shaft.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1, wherein exemplary embodiments and descriptions of the invention are provided to explain the invention, but not to limit the invention.

The invention provides an annular gap grinding device which comprises a grinding barrel 1 vertically arranged and a grinding rotor 4 extending into the grinding barrel and driven to rotate by a main shaft 2, wherein an annular gap 3 is formed between the grinding barrel and the grinding rotor. The invention adopts annular gap grinding, which is 3-5 times higher than the traditional ball mill in energy input efficiency, and the annular gap can adopt a conical design, i.e. the grinding rotor and the grinding barrel are designed into a cone with a large upper end and a small lower end, thereby further improving the energy input efficiency and the grinding effect. In the implementation process, the material and the grinding medium enter the annular gap from a feed inlet 11 and a medium inlet 12 which are arranged at the upper end of the grinding barrel respectively, the material flows to a separator 5 arranged at a discharge outlet 13 at the bottom end of the grinding barrel after being ground by the grinding medium and the rotating grinding rotor, the material is separated by the separator and flows out, and the grinding medium is blocked by the separator and then continuously participates in the grinding of new material. Therefore, the grinding media and the materials can be quickly focused near the separator at the lower end under the dual actions of self gravity and discharge pressure, so that the discharge efficiency can be improved, and the grinding media and the materials cannot be gathered near the main shaft to avoid abrasion of the main shaft, thereby prolonging the service life of the main shaft.

The grinding barrel 1 comprises a barrel body 14 forming the annular gap with the grinding rotor and an end cover 15 arranged at the top end of the barrel body and sealing the barrel body, and the structure is favorable for mounting, dismounting and overhauling the rotor and has better sealing performance; the top end of the end cover is provided with the feed inlet, the side wall of the end cover is horizontally provided with a medium inlet 12 for grinding medium to be added into the annular gap, and an online real-time adding mode can be adopted. The grinding rotor 4 of the invention comprises a rotating body 41 driven by the main shaft, a shaft hole 42 for installing the main shaft is axially arranged at the center of the rotating body, an annular cavity 43 is formed in the rotating body, the weight is light, and the energy consumption can be reduced; meanwhile, the annular cavity is not only favorable for heat dissipation, but also convenient for arrangement of cooling equipment, and ensures that heat generated by the rotating main body is quickly dissipated so as to prolong the service life of the rotor; a top cover 44 for sealing the annular cavity is arranged at the top end of the rotating body, so that the combined grinding device of the rotating body and the top cover is formed, the rotating body is convenient to process, and the installation, the maintenance and the disassembly are convenient. Preferably, the annular cavity is formed at the upper part of the rotating body, and the groove 45 is formed at the lower end face of the rotating body, so that the design of the groove not only can further reduce the mass of the rotor, but also is beneficial to discharging from the groove at the bottom.

Preferably, the separator is arranged in the groove, so that enough space is reserved for mounting and dismounting the separator, and convenience is improved; meanwhile, the bottom cover 49 which can be connected with the spindle bolt is arranged at the bottom of the groove, so that the spindle is convenient to mount, dismount and maintain; be provided with stirring vane 10 on the end cover, rotatory stirring vane can stir, disperse near separator's material and grinding medium to avoid blockking up the separator, improve discharging efficiency. The rotating body axial outer wall and the groove inner wall are provided with a plurality of bar pins 48, so that not only can the grinding effect be improved, but also the bar pins on the groove inner wall can further stir materials and grinding media near the separator, and therefore the separator is further prevented from being blocked, and the discharging efficiency is improved.

The grinding barrel 1 also comprises an outer barrel 17 which is sleeved outside the barrel body and is hermetically connected with the barrel body through a flange 7, a separation cavity 8 is formed between the outer barrel and the barrel body, cooling liquid or hot fluid can be introduced into the separation cavity and the annular cavity, the rotor and the grinding barrel can be cooled by the cooling liquid, and the service life of equipment is prolonged; the grinding of certain materials at the most suitable temperature can also be ensured by heating. Preferably, the bottom of the outer barrel is hermetically connected with a cover plate 18, a material pipe 40 communicated with the inner cavity of the separator is arranged on the cover plate, and the material separated by the separator vertically flows out of the material pipe under the dual actions of self gravity and a discharge pump, so that the discharge efficiency is effectively improved. In the implementation process, be provided with on the apron to separate the intracavity and let in the opening 19 of coolant liquid or hot-fluid, its processing, operation are comparatively convenient, outer bucket upper end lateral wall is equipped with the export 20 that supplies coolant liquid or hot-fluid outflow, and coolant liquid or hot-fluid form the circulation through separating the chamber from upwards down to cooling or heating staving are favorable to improving heat exchange efficiency.

The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.

Claims

1. The utility model provides an annular clearance grinder, includes the grinding barrel of vertical setting and stretches into this grinding barrel and drive rotatory grinding rotor by the main shaft, its characterized in that: an annular gap is formed between the grinding barrel and the grinding rotor, materials and grinding media enter the annular gap from a feed inlet and a medium inlet which are arranged at the upper end of the grinding barrel respectively, and the materials flow to a separator which is arranged at a discharge outlet at the bottom end of the grinding barrel after being ground by the grinding media and the rotating grinding rotor and then flow out after being separated by the separator.

2. The annular gap grinding apparatus of claim 1, wherein: the grinding barrel comprises a barrel body and an end cover, the barrel body and the grinding rotor form the annular gap, the end cover is arranged at the top end of the barrel body and seals the barrel body, the top end of the end cover is provided with the feed inlet, and the side wall of the end cover is horizontally provided with the medium inlet.

3. The annular gap grinding apparatus of claim 2, wherein: the grinding rotor comprises a rotating body driven by the main shaft, a shaft hole for installing the main shaft is axially formed in the center of the rotating body, an annular cavity is formed in the upper portion of the rotating body, a top cover for sealing the annular cavity is arranged at the top end of the rotating body, and a groove is formed in the end face of the lower portion of the rotating body.

4. The annular gap grinding apparatus of claim 3, wherein: the groove is internally provided with the separator.

5. The annular gap grinding apparatus of claim 4, wherein: the grinding barrel further comprises an outer barrel which is sleeved on the outer side of the barrel body and is in sealing connection with the barrel body through a flange, a separation cavity is formed between the outer barrel and the barrel body, and cooling liquid or hot fluid can be introduced into the separation cavity and the annular cavity.

6. The annular gap grinding apparatus of claim 5, wherein: the bottom of the outer barrel is hermetically connected with a cover plate, and a material pipe communicated with the inner cavity of the separator is arranged on the cover plate.

7. The annular gap grinding apparatus of claim 3, wherein: the bottom of the groove is provided with a bottom cover which can be connected with the spindle bolt, and the bottom cover is provided with a stirring blade.

8. The annular gap grinding apparatus of claim 1, wherein: the annular gap is tapered.

9. The annular gap grinding apparatus of claim 6, wherein: the cover plate is provided with an opening for introducing cooling liquid or hot fluid into the separation cavity, and the side wall of the upper end of the outer barrel is provided with an outlet for the cooling liquid or the hot fluid to flow out.