A ball mill and a grinding system for preparing heat-insulating ultrafine powder

Abstract

The present invention discloses a ball mill and a grinding system for preparing heat-insulating superfine powder, which includes a ball mill cylinder body. A welding slip ring is welded and provided on the outer surface of the material inlet end of the ball mill cylinder body, and a ring slip ring is provided on the outer surface of the material outlet end of the ball mill cylinder body. The bottom of both the welding slip ring and the ring slip ring is fitted with a journal bearing, and a concrete bench is fixedly provided at one end of the journal bearing away from the ball mill cylinder body. Through the ring slip ring composed of an outer slip ring, a partitioned ring, and an inner slip ring, the present invention can effectively prevent the temperature at the grinding tail of the ball mill cylinder body from being directly transmitted to the grinding tail journal bearing. At the same time, during the operation of the ball mill cylinder body, through the active engagement of the first tooth and the second tooth, a number of hollow cylinders can be rotated, and air can be sent into the inside of the ring slip ring through the inclined blades inside them. Coupled with the action of the air hole assembly, it can effectively prevent the problem that the temperature of the grinding tail journal bearing is too high, resulting in abnormal production.

Description

Technical Field

[0001] The present invention relates to the field of ball mills, and specifically to a heat-insulating ball mill for preparing ultrafine powder and a grinding system. Background Art

[0002] At present, the ball mills for preparing ultrafine powder are as follows: one is a general ball mill with hollow shafts at both ends, and the other is a ball mill with welded slipper bearings at both ends. Restricted by factors such as materials and casting technology, the specifications of the hollow shaft ball mill are limited and cannot meet the production lines with large outputs. The operation of the ball mill drives the throwing and grinding of the grinding media to crush and grind the materials. At the same time, noise and heat are generated, and the heat is easily conducted to the cylinder body. For the welded slipper bearings at both ends, the cylinder body is in direct contact with the bearing bushes, and the increase in the temperature of the cylinder body is likely to cause the increase in the temperature of the bearing bushes, especially the bearing bushes at the tail of the mill. It is very difficult to produce normally when the ambient temperature is high. For this reason, we have proposed a heat-insulating ball mill for preparing ultrafine powder and a grinding system. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat-insulating ball mill for preparing ultrafine powder and a grinding system to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A heat-insulating ball mill for preparing ultrafine powder, including a ball mill cylinder body, a welding slip ring is welded and provided on the outer surface of the material inlet end of the ball mill cylinder body, and a rolling ring slip ring is provided on the outer surface of the material outlet end of the ball mill cylinder body. The bottom of the welding slip ring and the rolling ring slip ring are both fitted with bearing bushes, and a concrete bench is fixedly provided at one end of the bearing bush away from the ball mill cylinder body. A protective sleeve frame is fixedly provided on the upper part of each concrete bench, and the two protective sleeve frames are respectively placed outside the welding slip ring and the rolling ring slip ring; a blowing mechanism, which plays a role in blowing and dissipating heat for the rolling ring slip ring, and the blowing mechanism is provided on one side end of the protective sleeve frame at the material outlet end; a protective mechanism, which plays a role in preventing dust from flying for the rolling ring slip ring and the blowing mechanism during the shutdown stage, the protective mechanism is provided outside the protective sleeve frame, and an extended limit mechanism for triggering the protective mechanism is further provided on the outer surface of the ball mill cylinder body. The welding slip ring is fixed on the outer surface of the ball mill cylinder body, and the welding slip ring is slidably supported by the bearing bush at the bottom.

[0005] Preferably, the rolling ring slip ring includes an outer slip ring, a partition rolling ring, and an inner slip ring. The partition rolling ring is placed between the outer slip ring and the inner slip ring, and the three are slidably connected to each other. The inner slip ring is fixedly bolted to the outer surface of the ball mill cylinder body, and the outer slip ring is in sliding contact with the bearing bush. Through the design of the outer slip ring, the partition rolling ring, and the inner slip ring, the partition rolling ring can prevent the heat generated by the ball mill cylinder body from being directly transmitted to the bearing bush at the tail of the ball mill cylinder body.

[0006] Preferably, an extension collar is fixedly installed on one end face of the protective sleeve frame sleeved outside the ring slip ring and facing the welding slip ring. A number of brackets evenly distributed at equal circumferential intervals are fixedly installed on the inner side wall of the extension collar. A hollow cylinder is rotatably arranged inside the brackets. A number of second ratchets evenly distributed at equal circumferential intervals are fixedly installed on the outer surfaces of both ports of the hollow cylinder. A number of first ratchets evenly distributed at equal circumferential intervals are also fixedly installed on the outer surface of the ball mill cylinder body. The first ratchet engages with the second ratchet movably. A number of inclined blades are fixedly arranged inside each hollow cylinder. That is, during the operation and rotation of the ball mill cylinder body, the hollow cylinder can be driven to rotate through the first ratchet on its surface and the second ratchet on the surface of the hollow cylinder, and there is also a speed increasing effect between the two.

[0007] Preferably, an air hole assembly is also arranged inside the ring slip ring. The air hole assembly includes a number of cavities evenly distributed at equal circumferential intervals arranged inside the partition ring. The cavities are parallel to the axis of the ball mill cylinder body. An air hole cylinder is fixedly installed inside each cavity. A number of ball bearings are rollingly embedded at both ends of the air hole cylinder. The ball bearings distributed at both ends of the air hole cylinder abut against the inner circumferential edges of the outer slip ring and the inner slip ring. The design of the cavities is to increase the contact area between the partition ring and the air, that is, the heat absorbed by the partition ring can be dissipated in the air faster.

[0008] Preferably, a number of spiral guiding blades evenly distributed at equal circumferential intervals are fixedly installed inside each air hole cylinder. The width of the spiral guiding blades extending towards both ends decreases gradually. The design purpose of the spiral guiding blades is that when the flowing air passes through the inside of the air hole cylinder, under the guidance of the spiral guiding blades, the flow path of the air inside the air hole cylinder can be extended. Compared with the flowing air directly passing through the air hole cylinder, the design of the spiral guiding blades can increase the heat dissipation effect, and the material of the spiral guiding blades can be copper.

[0009] Preferably, the protection mechanism includes two groups of protection flaps arranged outside one of the protective sleeve frames. The two groups of protection flaps are slidably attached to the two end faces of the protective sleeve frame respectively. The two groups of protection flaps are respectively placed on both sides of the ring slip ring. The number of each group of protection flaps is a number of them, and they are evenly distributed at equal circumferential intervals. The protection flaps are in the shape of arc sheets, and a number of protection flaps in each group form a ring. That is, when a number of protection flaps are combined together, they can just form a disc, which can seal the two ends of the protective sleeve frame. When unfolded, it is unfolded in an umbrella shape. A connecting plate is fixedly installed between two corresponding protection flaps in the front and back.

[0010] Preferably, a first skirt and a second skirt are fixedly installed on the outer surface of the protective sleeve frame located between the two groups of protective flaps. The outer diameters of the first skirt and the second skirt are the same, and they are respectively distributed at the two side edges of the protective sleeve frame. The designs of the first skirt and the second skirt are to play a bearing role in the sliding of the two groups of protective flaps, ensuring that the two groups of protective flaps can slide smoothly.

[0011] Preferably, the extension limiting mechanism includes a collar movably arranged on the outer surface of the ball mill cylinder body, and the bottom of the collar is fixedly connected to the concrete bench through a support rod. On the central axis of each protective flap close to the welding slip ring, an extension plate is vertically fixed, and a sliding column is fixedly arranged in the middle of the extension plate. A plurality of limiting cylinders are fixedly installed on the outer surface of the collar at equal circumferential intervals. The number of the limiting cylinders is the same as the number of each group of protective flaps, and the central axis of the limiting cylinder and the corresponding protective flap are on the same horizontal plane. A straight cylinder channel is opened inside the limiting cylinder, and the sliding column and the extension plate are both slidably embedded inside the straight cylinder channel. A spring is arranged at one end of the sliding column away from the ball mill cylinder body. A plurality of arc-shaped pushing rods for pushing the sliding column are also fixedly arranged on the outer surface of the ball mill cylinder body, and the plurality of arc-shaped pushing rods are distributed at equal circumferential intervals. When the ball mill cylinder body rotates, the sliding column can be frequently pushed by the arc-shaped pushing rods, enabling the protective flaps to be continuously unfolded.

[0012] Preferably, the straight cylinder channel is made of copper alloy material, and the sliding column is a magnet. When the sliding column moves inside the straight cylinder channel, the phenomenon of conductor cutting magnetic induction lines will occur, generating Ampere force, that is, electromagnetic damping.

[0013] A grinding system includes a ball mill for preparing heat-insulated ultrafine powder.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] Through the rolling ring slip ring composed of an outer slip ring, a partition rolling ring, and an inner slip ring, the present invention can effectively prevent the temperature at the tail of the ball mill cylinder body from being directly transmitted to the tail bearing of the mill. At the same time, during the operation of the ball mill cylinder body, through the active engagement of the first ratchet and the second ratchet, several hollow cylinders can rotate, and the inclined blades inside them can send air towards the inside of the rolling ring slip ring. Coupled with the action of the air hole assembly, it can effectively prevent the problem that the temperature of the tail bearing of the mill is too high and normal production cannot be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the rolling ring slip ring structure of the present invention;

[0018] Figure 3 For the present invention Figure 2 Enlarged view of part A in the present invention;

[0019] Figure 4 Schematic diagram of the extension collar structure of the present invention;

[0020] Figure 5 For the present invention Figure 4 Enlarged view of part B in the present invention;

[0021] Figure 6 Schematic diagram of the arc-shaped pushing rod structure of the present invention;

[0022] Figure 7 Schematic diagram of the unfolded state structure of the protective flap of the present invention;

[0023] Figure 8 Schematic diagram of the internal structure of the limiting cylinder of the present invention.

[0024] In the figure: 1, ball mill cylinder; 2, welding slip ring; 3, rolling ring slip ring; 3a, outer slip ring; 3b, partition rolling ring; 3c, inner slip ring; 4, protective sleeve frame; 5, air supply mechanism; 6, protective mechanism; 7, extension limiting mechanism; 8, air hole assembly; 9, bearing bush; 10, extension collar; 11, bracket; 12, hollow cylinder; 13, inclined blade; 14, first ratchet; 15, cavity; 16, air hole cylinder; 17, spiral guiding blade; 18, ball; 19, first skirt; 20, second skirt; 21, connecting plate; 22, protective flap; 23, collar; 24, arc-shaped pushing rod; 25, limiting cylinder; 26, straight cylinder channel; 27, sliding column; 28, extension plate; 29, spring; 30, second ratchet. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1: Please refer to Figures 1 - 5, A ball mill for preparing heat-insulating ultrafine powder in the illustration, including a ball mill cylinder body 1. A welding slip ring 2 is welded and provided on the outer surface of the material inlet end of the ball mill cylinder body 1, and a rolling ring slip ring 3 is provided on the outer surface of the material outlet end of the ball mill cylinder body 1. Bearing bushes 9 are fitted on the bottoms of the welding slip ring 2 and the rolling ring slip ring 3, and a concrete bench is fixedly provided at one end of the bearing bush 9 away from the ball mill cylinder body 1. A protective sleeve frame 4 is fixedly provided on the upper part of each concrete bench, and the two protective sleeve frames 4 are respectively placed outside the welding slip ring 2 and the rolling ring slip ring 3; an air supply mechanism 5, which plays a role in air supply and heat dissipation for the rolling ring slip ring 3, and the air supply mechanism 5 is provided on one side end of the protective sleeve frame 4 at the material outlet end; a protective mechanism 6, which plays a role in preventing dust from flying during the shutdown stage for the rolling ring slip ring 3 and the air supply mechanism 5, and the protective mechanism 6 is provided outside the protective sleeve frame 4, and an extended limit mechanism 7 for triggering the protective mechanism 6 is further provided on the outer surface of the ball mill cylinder body 1. The welding slip ring 2 is fixed on the outer surface of the ball mill cylinder body 1, and the bearing bush 9 at the bottom plays a role of sliding support for the welding slip ring 2.

[0027] The rolling ring slip ring 3 includes an outer slip ring 3a, a partition rolling ring 3b, and an inner slip ring 3c. The partition rolling ring 3b is placed between the outer slip ring 3a and the inner slip ring 3c, and the three are slidably connected to each other. The inner slip ring 3c is fixedly bolted to the outer surface of the ball mill cylinder body 1, and the outer slip ring 3a is in sliding contact with the bearing bush 9. Through the design of the outer slip ring 3a, the partition rolling ring 3b, and the inner slip ring 3c, the partition rolling ring 3b can prevent the heat generated by the ball mill cylinder body 1 from being directly transmitted to the bearing bush 9 at the tail of the ball mill cylinder body 1.

[0028] One end face of the protective sleeve frame 4 sleeved outside the rolling ring slip ring 3 facing the welding slip ring 2 is fixedly equipped with an extended collar 10, and a number of brackets 11 evenly distributed at equal circumferential intervals are fixedly installed on the inner side wall of the extended collar 10. A hollow cylinder 12 is rotatably provided inside the brackets 11, and a number of second ratchets 30 evenly distributed at equal circumferential intervals are fixedly installed on the outer surfaces of both ends of the hollow cylinder 12. A number of first ratchets 14 evenly distributed at equal circumferential intervals are further fixedly installed on the outer surface of the ball mill cylinder body 1, and the first ratchets 14 are movably engaged with the second ratchets 30. A number of inclined blades 13 are fixedly provided inside each hollow cylinder 12. That is, during the operation and rotation of the ball mill cylinder body 1, the hollow cylinder 12 can be driven to rotate through the first ratchets 14 on its surface and the second ratchets 30 on the surface of the hollow cylinder 12, and there is also an acceleration effect between the two.

[0029] The inside of the girth slip ring 3 is also provided with an air hole assembly 8. The air hole assembly 8 includes a number of cavities 15 that are arranged at equal circumferential intervals inside the partition girth 3b, and the cavities 15 are parallel to the axis of the ball mill cylinder 1. A wind hole cylinder 16 is fixedly installed inside each cavity 15, and a number of balls 18 are rollingly embedded at both ends of the wind hole cylinder 16. The balls 18 distributed at both ends of the wind hole cylinder 16 abut against the inner edges of the outer slip ring 3a and the inner slip ring 3c. The design of the cavity 15 is to increase the contact area between the partition girth 3b and the air, so that the heat absorbed by the partition girth 3b can be dissipated in the air faster.

[0030] A number of spiral guiding vanes 17 that are arranged at equal circumferential intervals are fixedly installed inside each wind hole cylinder 16. The width of the spiral guiding vanes 17 extending towards both ends decreases gradually. The design purpose of the spiral guiding vanes 17 is that when the flowing air passes through the inside of the wind hole cylinder 16, under the guidance of the spiral guiding vanes 17, the path of the air flowing inside the wind hole cylinder 16 can be extended. Compared with the flowing air directly passing through the wind hole cylinder 16, the design of the spiral guiding vanes 17 can increase the heat dissipation effect, and the material of the spiral guiding vanes 17 can be copper metal.

[0031] A grinding system, the grinding system includes a ball mill for preparing heat-insulated ultrafine powder.

[0032] The working principle of avoiding the temperature of the tail bearing 9 being too high and causing abnormal production: In this solution, a welded slip ring 2 is designed and welded at the grinding head of the ball mill cylinder 1, while a rolling type girth slip ring 3 is used at the tail of the mill. During the operation of the ball mill, when the temperature at the tail of the ball mill cylinder 1 is transferred towards the bearing 9, it will pass through the partition girth 3b, that is, it avoids direct heat transfer between the tail of the mill and the bearing 9 and prevents the bearing 9 from heating up too quickly;

[0033] At the same time, during the rotation of the ball mill cylinder 1, since the outer diameter of the ball mill cylinder 1 is much larger than the outer diameter of the hollow cylinder 12, that is, through the active engagement of the first gear 14 and the second gear 30, the hollow cylinder 12 can be rotated quickly. During the rotation process, through the inclined blades 13 designed inside a number of hollow cylinders 12, when the hollow cylinder 12 rotates at a high speed, a high-speed air flow can be sent towards the girth slip ring 3 through the action of the inclined blades 13. Through the scouring of the high-speed air flow, the heat attached to the girth slip ring 3 can be taken away relatively quickly, that is, the heat transferred to the bearing 9 through the girth slip ring 3 can be reduced;

[0034] In the air hole assembly 8 of this solution, a number of wind hole cylinders 16 are inserted inside the partition girth 3b, which can increase the contact area between the partition girth 3b and the air. At the same time, through the guidance of the spiral guiding vanes 17 on the air flow, the moving distance of the air flow inside the wind hole cylinder 16 can be increased, that is, the heat attached to the partition girth 3b can be taken away better;

[0035] It should be noted that in this solution, the spiral guiding vane 17 is made of metallic copper. The spiral guiding vane 17 made of metallic copper can further absorb the heat carried by the partition rolling ring 3b and dissipate it into the air.

[0036] Embodiment 2: Please refer to Figures 6 - 8 , this embodiment further describes Embodiment 1. The protection mechanism 6 includes two groups of protection flaps 22 arranged outside one of the protection sleeve frames 4. The two groups of protection flaps 22 are respectively in sliding fit with the two end faces of the protection sleeve frame 4, and the two groups of protection flaps 22 are respectively placed on both sides of the rolling ring slip ring 3. The number of each group of protection flaps 22 is several and is evenly distributed in a circumferential manner. The protection flap 22 is in an arc-shaped sheet, and several protection flaps 22 in each group form a ring, that is, when several protection flaps 22 are combined together, they can just form a disc, which can seal the two ends of the protection sleeve frame 4. When unfolded, it is in an umbrella-shaped expansion. A connecting plate 21 is fixedly installed between two protection flaps 22 corresponding to each other front and back.

[0037] On the outer surface of the protection sleeve frame 4 between the two groups of protection flaps 22, a first skirt 19 and a second skirt 20 are fixedly installed. The outer diameters of the first skirt 19 and the second skirt 20 are the same, and they are respectively distributed on the two side edges of the protection sleeve frame 4. The design of the first skirt 19 and the second skirt 20 is to play a bearing role in the sliding of the two groups of protection flaps 22, and can ensure that the two groups of protection flaps 22 can slide smoothly.

[0038] The extension and limit mechanism 7 includes a collar 23 movably arranged on the outer surface of the ball mill cylinder 1, and the bottom of the collar 23 is fixedly connected to the concrete bench through a support rod. On the central axis of each protection flap 22 close to the welding slip ring 2, an extension plate 28 is vertically fixed, and a sliding column 27 is fixedly arranged in the middle of the extension plate 28. On the outer surface of the collar 23, several limit cylinders 25 are fixedly installed and are evenly distributed in a circumferential manner. The number of the limit cylinders 25 is the same as the number of each group of protection flaps 22, and the limit cylinders 25 and the central axes of the corresponding protection flaps 22 are on the same horizontal plane. A straight cylinder channel 26 is opened inside the limit cylinder 25, and the sliding column 27 and the extension plate 28 are both slidably embedded inside the straight cylinder channel 26. A spring 29 is arranged at one end of the sliding column 27 away from the ball mill cylinder 1. On the outer surface of the ball mill cylinder 1, several arc-shaped pushing rods 24 for pushing the sliding column 27 are also fixedly arranged. The several arc-shaped pushing rods 24 are evenly distributed in a circumferential manner. When the ball mill cylinder 1 rotates, the sliding column 27 can be frequently pushed by the arc-shaped pushing rods 24, that is, the protection flaps 22 can be continuously unfolded.

[0039] In this embodiment: Since ball mills are usually used to grind various building materials, there is a lot of dust in the air in their working space. When the ball mill is not working, dust easily accumulates inside the hollow cylinder 12 and the air hole cylinder 16. If the excessive accumulation cannot be cleaned in time, it will reduce the heat dissipation effect on the partition roller ring 3b. Therefore, in this solution, when the ball mill stops running, the two groups of protective flaps 22 are combined under the action of the spring 29, that is, they can close the spaces at both ends of the roller ring slip ring 3, and can prevent dust from accumulating inside the hollow cylinder 12 and the air hole cylinder 16;

[0040] When the ball mill is running, the rotation of the ball mill cylinder 1 can synchronously push several extension plates 28 through the arc-shaped pushing rods 24 on its surface, compressing the spring 29. At this time, the movement of the extension plates 28 can make several protective flaps 22 expand synchronously. During the continuous rotation of the ball mill cylinder 1, several arc-shaped pushing rods 24 can continuously and alternately push several protective flaps 22 to make them expand. Even the elastic force exerted on the sliding column 27 due to the compression of the spring 29 cannot make the protective flaps 22 completely close under the continuous rotation of several arc-shaped pushing rods 24. At this time, the two groups of protective flaps 22 will show a reciprocating expansion and contraction phenomenon, enabling a large amount of air flow to pass through the roller ring slip ring 3 during the operation of the ball mill cylinder 1.

[0041] Embodiment 3: Please refer to Figure 8 , this embodiment further illustrates other embodiments. The straight cylinder channel 26 is made of copper alloy material, and the sliding column 27 is a magnet.

[0042] In this embodiment: In this solution, when the sliding column 27 moves inside the straight cylinder channel 26, the phenomenon of a conductor cutting magnetic induction lines will occur, thereby generating Ampere force, that is, electromagnetic damping. When the arc-shaped pushing rod 24 pushes the sliding column 27 and the extension plate 28, the resistance brought by electromagnetic damping can be directly ignored. When the elastic force generated by the compression of the spring 29 makes the sliding column 27 move back, at this time, the electromagnetic damping will offset part of the elastic force and slow down the reset speed of the sliding column 27, that is, slow down the merging speed of the protective flaps 22, so that the outside air flow can pass through the roller ring slip ring 3 better.

[0043] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to this process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball mill for preparing heat-insulating ultrafine powder, comprising a ball mill cylinder (1), characterized in that: On the outer surface of the material inlet end of the ball mill cylinder (1), a welding slip ring (2) is welded, and on the outer surface of the material outlet end of the ball mill cylinder (1), a rolling ring slip ring (3) is provided. At the bottom of both the welding slip ring (2) and the rolling ring slip ring (3), a bearing bush (9) is fitted, and at one end of the bearing bush (9) away from the ball mill cylinder (1), a concrete bench is fixedly provided. On the upper part of each concrete bench, a protective sleeve frame (4) is fixedly provided, and the two protective sleeve frames (4) are respectively placed outside the welding slip ring (2) and the rolling ring slip ring (3); A air supply mechanism (5) which plays a role of air supply and heat dissipation for the rolling ring slip ring (3), and the air supply mechanism (5) is arranged on one side end of the protective sleeve frame (4) at the material outlet end; A protective mechanism (6) which plays a role of dust prevention for the rolling ring slip ring (3) and the air supply mechanism (5) during the shutdown stage, and the protective mechanism (6) is arranged outside the protective sleeve frame (4); The rolling ring slip ring (3) includes an outer slip ring (3a), a partition rolling ring (3b), and an inner slip ring (3c). The partition rolling ring (3b) is placed between the outer slip ring (3a) and the inner slip ring (3c), and the three are slidably connected to each other. The inner slip ring (3c) is fixedly bolted to the outer surface of the ball mill cylinder (1), and the outer slip ring (3a) is in sliding contact with the bearing bush (9); One end face of the protective sleeve frame (4) sleeved outside the rolling ring slip ring (3) facing the welding slip ring (2) is fixedly equipped with an extension collar (10), and on the inner side wall of the extension collar (10), a number of brackets (11) evenly distributed at equal circumferential intervals are fixedly installed. Inside the brackets (11), a hollow cylinder (12) is rotatably provided, and on the outer surfaces of both ends of the hollow cylinder (12), a number of second ratchets (30) evenly distributed at equal circumferential intervals are fixedly installed. On the outer surface of the ball mill cylinder (1), a number of first ratchets (14) evenly distributed at equal circumferential intervals are also fixedly installed, and the first ratchets (14) are movably engaged with the second ratchets (30). Inside each hollow cylinder (12), a number of inclined blades (13) are fixedly provided; Inside the rolling ring slip ring (3), there is also an air hole assembly (8). The air hole assembly (8) includes a number of cavities (15) evenly distributed at equal circumferential intervals and opened inside the partition rolling ring (3b), and the cavities (15) are parallel to the axis of the ball mill cylinder (1). Inside each cavity (15), an air hole cylinder (16) is fixedly installed, and at both ends of the air hole cylinder (16), a number of balls (18) are rollingly embedded. The balls (18) distributed at both ends of the air hole cylinder (16) abut against the inner edges of the outer slip ring (3a) and the inner slip ring (3c); Inside each air hole cylinder (16), a number of spiral guiding blades (17) evenly distributed at equal circumferential intervals are fixedly installed, and the width of the spiral guiding blades (17) extending towards both ends gradually decreases.

2. The ball mill for preparing heat-insulating ultrafine powder according to claim 1, wherein: The protection mechanism (6) includes two groups of protection flaps (22) arranged outside one of the protection sleeve frames (4). The two groups of protection flaps (22) are respectively in sliding contact with the two end faces of the protection sleeve frame (4), and the two groups of protection flaps (22) are respectively placed on both sides of the rolling ring slip ring (3). The number of each group of protection flaps (22) is several, and they are evenly distributed in a circle. The protection flaps (22) are in the shape of arc sheets, and several protection flaps (22) in each group form a ring. A connecting plate (21) is fixedly installed between two protection flaps (22) that correspond to each other front and back.

3. The ball mill for preparing heat-insulating ultrafine powder according to claim 2, characterized in that: On the outer surface of the protection sleeve frame (4) between the two groups of protection flaps (22), a first skirt (19) and a second skirt (20) are fixedly installed. The outer diameters of the first skirt (19) and the second skirt (20) are the same, and they are respectively distributed at the two side edges of the protection sleeve frame (4).

4. The ball mill for preparing heat-insulating ultrafine powder according to claim 3, wherein: An extension limiting mechanism (7) for touching the protection mechanism (6) is provided on the outer surface of the ball mill cylinder (1). The extension limiting mechanism (7) includes a ferrule (23) movably arranged on the outer surface of the ball mill cylinder (1), and the bottom of the ferrule (23) is fixedly connected to the concrete bench through a support rod. On the central axis of each protection flap (22) close to the welding slip ring (2), an extension plate (28) is fixedly arranged vertically, and a sliding column (27) is fixedly arranged in the middle of the extension plate (28). A number of limiting cylinders (25) evenly distributed in a circle are fixedly installed on the outer surface of the ferrule (23). The number of the limiting cylinders (25) is the same as the number of each group of protection flaps (22), and the central axis of the limiting cylinder (25) is on the same horizontal plane as that of the corresponding protection flap (22). A straight cylinder channel (26) is opened inside the limiting cylinder (25), and the sliding column (27) and the extension plate (28) are both slidably embedded inside the straight cylinder channel (26). A spring (29) is arranged at one end of the sliding column (27) away from the ball mill cylinder (1). A number of arc-shaped pushing rods (24) for pushing the sliding column (27) are also fixedly arranged on the outer surface of the ball mill cylinder (1).

5. The ball mill for preparing heat-insulating ultrafine powder according to claim 4, wherein: The straight cylinder channel (26) is made of copper alloy material, and the sliding column (27) is a magnet.

6. A grinding system, characterized in that: The grinding system includes the heat-insulating type ultrafine powder preparation ball mill according to any one of claims 1-5.

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