Energy-saving ball mill with built-in planetary impact mechanism

Abstract

The utility model provides an energy-saving ball mill with a built-in planetary impact mechanism, which can solve the problem of wall attachment of the ball mill, enable the ball mill not to be limited by the limit rotating speed, and also can solve the problem of sticky grinding of the ball mill at the conventional rotating speed, so as to improve the grinding efficiency and effect and reduce the energy consumption of the ball mill, and relates to the technical field of industrial powder preparation. The utility model discloses an energy-saving ball mill with a built-in planetary impact mechanism. The energy-saving ball mill comprises a rack and a barrel, the device further comprises a fixed gear and at least one impact mechanism which is installed in the cylinder body and arranged around the axis of the cylinder body. The impact mechanism comprises a planet shaft, the planet shaft is rotationally connected with the cylinder body, and an impact plate for scraping, impacting and colliding the wall-attached materials in the cylinder body is arranged on the planet shaft; the fixed gear is arranged at one end of the cylinder body, the fixed gear and the cylinder body are coaxially arranged, and the fixed gear is fixedly installed on the rack; a planetary gear meshed with the fixed gear is arranged at the end, close to the fixed gear, of the planetary shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial powder preparation, in particular to an energy-saving ball mill with a built-in planetary impact mechanism which can eliminate the influence of wall attachment and sticking of a ball mill and is particularly suitable for the production of ultrafine powders. Background Art

[0002] As is known, ball mill is a basic mechanical grinding equipment, which is widely used in metallurgy, building materials, chemical industry and other industries, especially in the grinding production of metallurgical ore dressing and building materials cement. The main reasons for the wide application of ball mill are: 1. Excellent grinding performance, nearly spherical powder particles, reasonable particle size distribution; 2. Stable and reliable continuous operation; 3. Large single machine production capacity.

[0003] As is known to all, high energy consumption is an inherent disadvantage of ball mills. According to the crushing function theory of Ansdm, pure mechanical losses of bearings, gears, etc. are 12.3%, product heat dissipation is 47.6%, radiation heat emitted by the mill cylinder is 6.4%, heat taken away by air is 31.4%, and the energy used for grinding materials is about 2% to 3%. The effective energy utilization rate of ball mills is extremely low.

[0004] A key technical limitation that restricts the ball mill from improving its energy efficiency is the cylinder limit (critical) speed. To achieve the purpose of grinding, a traditional ball mill requires two basic movements: one is the relative separation movement between the material grinding body and the cylinder; the other is the mutual collision and impact movement between the grinding body and the material. To achieve the relative separation of the material and the grinding body from the cylinder, the theory requires that the centrifugal force acceleration generated by the cylinder rotation on the material grinding body cannot be greater than the gravity acceleration of the material falling, that is, the cylinder limit speed must be less than the theoretical speed formula: n = 424 / √d, revolutions per minute (d is the effective cylinder inner diameter, unit cm). The actual speed is generally 75-85% of the limit speed. Too high or too low a speed will affect and destroy the overall parabolic motion of the material grinding body. When the cylinder speed reaches or exceeds the limit speed, the grinding body material and the cylinder remain relatively stationary and rotate with the cylinder, resulting in a "wall-attached" motion state, which is not allowed in traditional ball mills.

[0005] The mutual impact movement between the material and the grinding body of the traditional ball mill mainly relies on the grinding body moving in the same direction in a parabola to impact the material to complete the crushing. The crushing efficiency of the same-direction impact is very low, mainly for three reasons: First, the grinding body that falls later produces a relative impact movement on the material that falls to the bottom first. In theory, the grinding body can only produce one impact after the cylinder rotates once, and the overall number of impacts is small; second, the impact speed is low due to the limited rotation speed of the cylinder, and the average impact speed is even lower; third, the parabolic relative impact speed of the material grinding body in the grinding chamber is generally linearly distributed from zero to the maximum impact speed, and a large number of grinding bodies that are less than the minimum impact kinetic energy threshold have a near-zero efficiency in impacting and crushing the material.

[0006] To crush materials of different sizes, shapes and properties, different minimum impact kinetic energy thresholds are required. The impact effect that is less than the minimum impact kinetic energy threshold is close to zero efficiency for material crushing. In order to meet the necessary kinetic energy impact threshold and improve crushing efficiency, traditional ball mills have only two basic measures: 1. Increase the effective cylinder diameter of the mill; 2. Increase the mass of the grinding body. Both measures have disadvantages: increasing the cylinder diameter is limited, and the manufacturing and transportation of mills with a diameter of more than 5 meters are subject to technical and economic restrictions, and are rarely used in actual industrial fields; increasing the mass of the grinding body will increase the operating weight of the equipment and correspondingly reduce the number of overall material impact crushing times.

[0007] As is known, traditional ball mills using dry production processes are mainly used to produce conventional fine powders and are generally not used to produce ultrafine powders. The main reason is the "sticking and grinding" problem of ball mills producing ultrafine powders. The enhancement of the Van der Waals molecular agglomeration of ultrafine powders is the main mechanism of the "sticking and grinding" problem. The powder grinding fineness and the moisture content of the grinding material are the two main factors affecting the "sticking and grinding" problem. The "sticking and grinding" effect is manifested in the formation of a layer of fine powder that is separated from the grinding body and gradually thickened around the inner periphery of the cylinder; as a result, the ball mill gradually reduces the grinding efficiency until it loses its grinding ability. The production of traditional ball mills needs to avoid the "sticking and grinding" problem as much as possible. The main solutions are: first, reduce the moisture content of the grinding material; second, increase the powder particle size, or increase the proportion of coarse powder. Unlike the "wall attachment" problem of the ball mill limited by the limit speed, the "sticking and grinding" problem will also occur when the cylinder speed of the ball mill is lower than the limit speed. There are also differences in the manifestations of the "sticking and wearing" problem and the "wall attachment" problem: "sticking and wearing" is manifested in the formation of a powder layer in the circumferential direction inside the rotating cylinder; "wall attachment" is manifested in the formation of a mixed accumulation layer of materials and grinding bodies in the circumferential direction inside the rotating cylinder.

[0008] Breaking through the speed limit of ball mills, improving ball mill grinding efficiency and reducing energy consumption are the goals that the industrial grinding industry has been striving to achieve and pursue for a long time. So far, there has been no substantial breakthrough in the development of high-efficiency ball mills with super-speed limit for industrial-scale application.

[0009] One meaningful direction is the planetary ball mill (commonly known as planetary mill), which can greatly improve the grinding efficiency and save energy consumption several times. However, the planetary ball mill has a fatal flaw. Its principle and structure make it difficult to solve the problem of continuous feeding and discharging. The current situation is that high-efficiency planetary ball mills are only used in small experimental mills that operate discontinuously.

[0010] The Chinese patent application with the publication number CN101856632A discloses a horizontal high-speed compound ball mill, including a cylinder and a power device for driving the cylinder to rotate, wherein a reverse rotating device in the opposite direction of the cylinder rotation is installed in the cylinder; the reverse rotating device includes a rotating shaft, which passes through the cavity of the cylinder, a stirring tool is provided on the rotating shaft located in the cavity, and a driver is provided on the rotating shaft extending out of the cavity. When the ball mill is working, the driver drives the rotating shaft to rotate in the direction opposite to the rotation direction of the cylinder, and the stirring tool is driven to move during the rotation of the rotating shaft, and the stirring tool drives the steel balls and the material to be ball-milled to move in the opposite direction to achieve the purpose of eliminating the centrifugal force of the steel balls and thus breaking through the critical limit of the cylinder rotation speed. The patent does not specify whether the axis of its reverse rotating device coincides with the central axis of the rolling cylinder, but it is coincident from the patent drawings. Combined with other dependent claims of the patent, it is difficult for the patent to achieve the purpose of "eliminating the centrifugal force of the steel balls and thus breaking through the critical limit of the drum rotation speed". Regardless of whether the reverse rotating device installed in the drum is coaxial with the drum, the main effect of the stirring tool set on the reverse rotating shaft on the steel balls is to strengthen and change the collision speed and direction between the steel balls or between the steel balls and the materials, but it cannot achieve "effective elimination of the centrifugal force of the steel balls". Because the stirring tool set on the reverse rotating shaft faces a contradiction in the radial length setting of the reverse rotating shaft: if the stirring tool is set too short, the stirring tool of the reverse rotating device has limited collision effect on the parabolic falling steel balls in the cylinder, and it is difficult to penetrate the falling materials and steel balls, and act on the wall-attached materials and steel balls inside the cylinder; if the stirring tool is set too long, it will destroy the necessary movement of the materials and steel balls below the cylinder with the rotation direction of the cylinder. Therefore, if the reverse rotating shaft and the reverse rotating stirring tool are reasonably set in this patent, it can only strengthen the collision between steel balls or between steel balls and materials, and improve the partial grinding efficiency; but it cannot achieve the purpose of "eliminating the centrifugal force of steel balls" and "breaking through the critical limit of the cylinder speed" as claimed in the patent application. Utility Model Content

[0011] The technical problem to be solved by the utility model is to provide an energy-saving ball mill with a built-in planetary impact mechanism, which can eliminate the problem of wall attachment of the ball mill, make the ball mill not limited by the maximum speed, and eliminate the sticking problem of the ball mill at a conventional speed, so as to improve the grinding efficiency and effect and reduce the energy consumption of the ball mill.

[0012] The utility model solves the technical problem by adopting the following technical solution: an energy-saving ball mill with a built-in planetary impact mechanism, comprising a frame and a cylinder, one end of the cylinder is provided with a feeding hollow shaft, the other end is provided with a discharging hollow shaft, the cylinder is rotatably mounted on the frame; further comprising a fixed gear and at least one impact mechanism installed in the cylinder and arranged around the axis of the cylinder so as to be able to orbit around the axis of the cylinder with the cylinder;

[0013] The impact mechanism comprises a planetary shaft, which is arranged along the axis direction of the cylinder, the planetary shaft is rotatably connected to the cylinder, and an impact plate is provided on the planetary shaft for scraping and impacting the wall-attached material in the cylinder;

[0014] The fixed gear is arranged at one end of the cylinder and coaxially arranged with the cylinder, and the fixed gear is mounted and fixed on the frame;

[0015] One end of the planetary shaft close to the fixed gear extends out of the cylinder and is provided with a planetary gear meshed with the fixed gear to drive the planetary shaft to rotate around its own axis.

[0016] Furthermore, the fixed gear is an internal gear, and the planetary gear is arranged inside the fixed gear and meshes with the internal gear.

[0017] Furthermore, the fixed gear is an external gear, and the planetary gear is arranged on the outside of the fixed gear and meshes with the outside of the fixed gear.

[0018] Furthermore, a box including the fixed gear and the planetary gear is provided on the frame.

[0019] Furthermore, the cylinder is rotatably connected to the frame via a feeding hollow shaft and a discharging hollow shaft at both ends.

[0020] Furthermore, the feed hollow shaft and the discharge hollow shaft are both rotatably connected to the frame via spherical roller bearings or spherical bush bearings, and the planetary shaft is rotatably connected to the cylinder via spherical roller bearings.

[0021] Furthermore, the distance from the planetary shaft to the side wall of the cylinder is smaller than the distance from the planetary shaft to the axis of the cylinder.

[0022] Furthermore, there are at least two impact mechanisms, and the impact mechanisms are evenly arranged around the axis of the cylinder.

[0023] Furthermore, at least two groups of the impact plates are arranged on the planetary shaft along the axis direction of the planetary shaft, each group of the impact plates includes at least two impact plates, and the impact plates of each group are evenly arranged around the planetary shaft.

[0024] Furthermore, each group of the impact plates consists of four impact plates.

[0025] Furthermore, along the axis direction of the planetary shaft, the impact plates of two adjacent groups are staggeredly arranged.

[0026] The beneficial effects of the utility model are:

[0027] A. High efficiency and energy saving

[0028] The effective energy utilization of traditional ball mills is very low. The fundamental reason is that they are limited by the limit speed. A large number of grinding bodies and materials rotate with the cylinder to produce limited height parabolic co-directional impacts, and the effective energy utilization rate is extremely low, less than 3%. The ball mill of the utility model can break through the limit speed limit, increase the impact force by several times to dozens of times, and change the inefficient parabolic co-directional impact crushing of the traditional ball mill into efficient spatial dynamic strong dispersion impact crushing. The ball mill of the utility model can theoretically approach or reach the effective energy utilization rate of the crusher, that is, the effective energy utilization rate reaches 20% to 30. Considering that the overall motion mass of the ball mill is greater than the mass of the moving body of the crusher, affected by the dynamic balance of the moment of inertia, the material impact linear velocity that can actually be achieved by the utility model is lower than the impact linear velocity of the crusher, that is, the effective energy utilization rate is lower than that of the crusher. If calculated based on 50% of the effective energy utilization rate of the crusher, compared with the traditional ball mill, the utility model can also achieve an energy saving effect of 70-80%, and improve the energy utilization efficiency by 4-5 times.

[0029] B. Reduce the size and weight of the main equipment

[0030] Compared with the traditional ball mill, the utility model can achieve several to dozens of times of spatial dynamic efficient impact crushing times in the same grinding chamber space; under the condition of obviously the same production capacity, the volume and weight of the main equipment are several times smaller than those of the traditional ball mill.

[0031] C. Reduce the size and weight of the main transmission

[0032] Compared with the traditional ball mill, the utility model can increase the drum speed several times without being limited by the limit speed. Under the condition of the same transmission power, the torque of the drum transmission device of the utility model is also reduced several times, which can greatly reduce the volume and weight of the main transmission device.

[0033] D. Change the current situation that traditional ball mills cannot produce ultrafine powders by dry method

[0034] The ball mill of the utility model can eliminate the "sticking grinding" problem of the ball mill dry process for producing ultrafine powders, that is, it can change the current situation that the traditional ball mill cannot produce ultrafine powders by dry process. Combined with other advantages of the utility model, the utility model can be used for the efficient and energy-saving production of ultrafine powders.

[0035] E. Reduce the aspect ratio of the mill drum and reduce manufacturing difficulty

[0036] Traditional ball mills are limited by the difficulty of increasing the diameter, and usually adopt a large aspect ratio design, generally with an aspect ratio greater than 2. The ball mill of the utility model has high efficiency and can adopt a small aspect ratio design under the same production capacity, such as an aspect ratio less than 1, and the small aspect ratio design can reduce the difficulty of manufacturing traditional ball mills.

[0037] F. Reduce the overall mass of the grinding body and reduce the mass of the monomer

[0038] The utility model can reduce the overall mass of the grinding body and the mass of the grinding body monomer by several times compared with the traditional ball mill by increasing the rotating speed of the drum body which is not limited by the limiting rotating speed and realizing the space dynamic efficient impact crushing.

[0039] G. Adaptive speed

[0040] Different materials have different impact speed requirements; for example, high-hardness materials require high kinetic energy impact thresholds, while low-hardness materials require low kinetic energy impact thresholds. Compared with traditional ball mills with fixed speeds, the speed of the utility model can be set more flexibly, and can be conveniently designed as a variable frequency speed mill to meet the needs of efficient grinding of different materials.

[0041] H. Low manufacturing cost

[0042] The utility model has a fixed gear on the cylinder, and a planetary gear meshing with the fixed gear on the planetary shaft. The planetary shaft can be driven to rotate directly by the driving device of the cylinder, and there is no need to separately set up an impact driving device for driving the planetary shaft to rotate, thereby reducing the manufacturing cost of the ball mill and making the later enclosure more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the ball mill of the utility model;

[0044] Figure 2 It is another structural schematic diagram of the ball mill of the utility model;

[0045] Figure 3 yes Figure 2 Section along AA;

[0046] Figure 4 This is a working schematic diagram when the rotation direction of the planetary shaft is the same as the rotation direction of the cylinder;

[0047] Figure 5 This is a working schematic diagram when the rotation direction of the planetary shaft is opposite to the rotation direction of the cylinder;

[0048] Figure 6 It is a schematic diagram of the structure in which the impact plates are staggered along the axis direction of the planetary shaft;

[0049] Figure 7 It is a schematic diagram of the structure in which the impact plates are arranged correspondingly along the axis direction of the planetary shaft;

[0050] As shown in the figure: 1-frame, 2-cylinder, 3-impact mechanism, 4-fixed gear, 5-planetary gear, 6-spherical roller bearing, 11-housing, 21-feed hollow shaft, 22-discharge hollow shaft, 23-axis line, 31-planetary shaft, 32-impact drive device, 33-impact plate, area B - the movement trajectory of the impact plate to clean the wall-attached area of ​​the material grinding body, area C - the remaining wall-attached area of ​​the material grinding body. DETAILED DESCRIPTION

[0051] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0052] like Figures 1 to 3 As shown, the utility model is an energy-saving ball mill with a built-in planetary impact mechanism, comprising a frame 1 and a barrel 2, wherein one end of the barrel 2 is provided with a feed hollow shaft 21, and the other end is provided with a discharge hollow shaft 22, and the barrel 2 is rotatably mounted on the frame 1 so that the barrel 2 can rotate around its own axis 23; it also includes a fixed gear 4 and at least one impact mechanism 3 installed in the barrel 2 and arranged around the axis of the barrel 2 so as to be able to revolve around the axis of the barrel 2 with the barrel 2, the impact mechanism 3 includes a planetary shaft 31, the planetary shaft 31 is arranged along the axis direction of the barrel 2, the planetary shaft 31 is rotatably connected with the barrel 2 so that the planetary shaft 31 can rotate around its own axis, that is, rotate, and the planetary shaft 31 is provided with an impact plate 33 for scraping, impacting and colliding the wall material in the barrel 2. The fixed gear 4 is arranged at one end of the cylinder 2 and coaxially with the cylinder 2, and the fixed gear 4 is installed and fixed on the frame 1; the planetary shaft 31 extends out of the cylinder 2 at one end close to the fixed gear 4 and is provided with a planetary gear 5 that meshes with the fixed gear 4 to drive the planetary shaft 31 to rotate around its own axis.

[0053] The feed hollow shaft 21 and the discharge hollow shaft 22 can be fixedly mounted on the cylinder 2 by welding, bolt connection, etc. Of course, the feed hollow shaft 21 and the discharge hollow shaft 22 can also be an integral structure with the cylinder 2.

[0054] When the ball mill of the utility model is working, the cylinder driving device is used to drive the cylinder 2 to rotate. During the rotation of the cylinder 2, the planetary shaft 31 is driven to rotate around the axis of the cylinder 2, that is, to revolve. The gas required for the material and the discharge enters the cylinder 2 from the feeding hollow shaft 21 and flows out from the discharging hollow shaft 22 after being ground. Since the fixed gear 4 is fixed to the frame 1, the planetary shaft 31 revolves around the axis of the cylinder 2, which causes the planetary gear 5 meshing with the fixed gear 4 to revolve around the fixed gear 4 and rotate on its own, thereby driving the planetary shaft 31 to rotate around its own axis while the cylinder rotates. Figure 1As shown, when the fixed gear 4 is an external gear, and the planetary gear 5 is arranged on the outside of the fixed gear 4 and meshes with the outside of the fixed gear 4, the planetary shaft 31 can rotate around its own axis in the same direction as the cylinder during the rotation of the cylinder (see Figure 4 ). Figure 4 In the embodiment, the cylinder rotates clockwise and the planetary shaft 31 rotates clockwise. Figure 2 As shown, when the fixed gear 4 is an internal gear and the planetary gear 5 is arranged in the fixed gear 4 and meshes with the fixed gear 4, the planetary shaft 31 can rotate around its own axis in the opposite direction to the cylinder during the rotation of the cylinder (see Figure 5 ). Figure 5 In the embodiment of the present invention, the cylinder body rotates counterclockwise and the planetary shaft 31 rotates clockwise.

[0055] like Figure 4 and Figure 5 As shown, the specific working principle of the ball mill of the present invention is as follows: the movement trajectory of the impact plate 33 in the B area indicates the cleaning of the material grinding body attached to the wall area, and the C area indicates the remaining wall attached area of ​​the material grinding body. The B and C areas together constitute the entire material grinding body attached to the wall area; during the operation of the ball mill, the cylinder rotates while driving the planetary shaft 31 to revolve around the cylinder axis and rotate. The planetary shaft 31 drives the impact plate to rotate during the rotation process. The rotating impact plate 33 scrapes and impacts the material grinding body in the entire B area. The scraped part of the material grinding body in the B area is subjected to force movement and impacts the material grinding body in the adjacent C area. The chain reaction eliminates part of the material grinding body attached to the wall in the C area, thereby breaking through the maximum speed limit of the ball mill. The ball mill of the utility model sets the impact mechanism around the axis of the cylinder 2, so that the material grinding body can pass through the central area of ​​the cylinder 2 and fall, and can also produce secondary impact and throwing of the fallen material grinding body, so as to generate sufficient impact movement, so the ball mill of the present application has higher ball milling efficiency and better ball milling effect (better particle size consistency), and its effective energy utilization rate is higher and energy consumption is lower. And the ball mill of the present application can directly use the driving device of the cylinder to drive the planetary shaft to rotate, and there is no need to set up a separate impact driving device to drive the planetary shaft to rotate, which is convenient for realizing the revolution and rotation of the built-in impact plate 33 of the cylinder 2, which is conducive to controlling the manufacturing cost of the ball mill.

[0056] It should be noted that, compared with the structure in which the fixed gear 4 is an internal gear and the planetary gear 5 is arranged inside the fixed gear 4 and meshes with the inside of the fixed gear 4, and the structure in which the fixed gear 4 is an external gear and the planetary gear 5 is arranged outside the fixed gear 4 and meshes with the outside of the fixed gear 4, the former makes the planetary shaft 31 rotate in the opposite direction of the cylinder around its own axis, and the latter makes the planetary shaft 31 rotate in the same direction as the cylinder around its own axis. Under the same rotation speed of the planetary shaft 31, the former can make the impact plate have a stronger impact effect and a better effect of eliminating the wall attachment effect, but at the same time it has a certain impact on the effect of the cylinder 2 driving the material to rotate and lift, while the latter has a relatively poor impact effect, but is beneficial to the lifting of the material in the cylinder.

[0057] It can be understood that the number of impact mechanisms 3 has an impact on the effect of eliminating the wall-attached materials, especially the effect of eliminating the wall-attached materials in the C area. Generally speaking, under the premise of not interfering with each other, the more impact mechanisms 3 in the same cylinder body, the more beneficial it is to eliminate the wall-attached materials. Specifically, the more impact mechanisms 3 there are, the more impact mechanisms 3 can not only scrape and impact the material grinding bodies attached to the wall, but also more easily produce secondary impacts and throw off the material grinding bodies that fall on them, so that the material grinding bodies in the cylinder body 2 undergo multi-directional dynamic impacts in space, and therefore, it is more beneficial to improve the effect and efficiency of the ball mill. In order to ensure the balance of the cylinder body 2, generally speaking, there are at least two impact mechanisms 3, and the impact mechanisms 3 are evenly arranged around the axis of the cylinder body 2, that is, the impact mechanisms 3 are evenly arranged on a circular ring centered on the axis of the cylinder body 2. Figure 3 In the embodiment, there are eight impact mechanisms 3 which are evenly arranged around the axis of the cylinder 2.

[0058] It is understandable that the rotation speed of the planetary shaft 31 also affects the effect of eliminating the wall-attached materials, and a suitable value can be obtained through field experiments according to the type of materials, the rotation speed of the cylinder 2, the number of planetary shafts, etc. Then, the transmission ratio of the fixed gear and the planetary gear is designed accordingly according to the value.

[0059] In order to protect the fixed gear 4 and the planetary gear 5 , in the utility model, a box body 11 including the fixed gear 4 and the planetary gear 5 is provided on the frame 1 .

[0060] In the present invention, specifically, the cylinder 2 is rotatably connected to the frame 1 through the feeding hollow shaft 21 and the discharging hollow shaft 22 at both ends. In some embodiments, the cylinder 2 rotates with the frame 1 through the middle part between the feeding hollow shaft 21 and the discharging hollow shaft 22.

[0061] The feed hollow shaft 21 and the discharge hollow shaft 22 can be rotatably connected to the frame 1 through various bearings or bushings, and the planetary shaft 31 can also be rotatably connected to the cylinder 2 through various bearings or bushings. In the present utility model, preferably, the feed hollow shaft 21 and the discharge hollow shaft 22 are rotatably connected to the frame 1 through a spherical roller bearing 6 or a spherical bushing bearing, and the planetary shaft 31 is rotatably connected to the cylinder 2 through a spherical roller bearing 6, so as to realize automatic centering of the cylinder and the planetary shaft, simplify the manufacturing and installation accuracy of the ball mill, and improve the service life of the ball mill.

[0062] The position of the planetary shaft 31 can be set at any position in the area between the side wall of the cylinder 2 and the axis of the cylinder 2. Figure 3 As shown, in the present invention, optimally, the distance f from the planetary shaft 31 to the side wall of the cylinder 2 is smaller than the distance e from the planetary shaft 31 to the axis of the cylinder 2. The above structure will inevitably prevent the impact plate 33 from sweeping the central area of ​​the cylinder 2 during the rotation of the planetary shaft 31, so that the central area of ​​the cylinder 2 has a larger cavity area, which is more conducive to the impact movement of the material grinding body, and can further improve the grinding efficiency and effect of the ball mill.

[0063] The impact plate 33 may be a straight plate, a spiral structure, etc. Along the axial direction of the planetary shaft 31, only one relatively long impact plate 33 may be arranged, and along the circumferential direction of the planetary shaft 31, one or more impact plates 33 may be arranged. Figure 6 , Figure 7 As shown, in the utility model, along the axial direction of the planetary shaft 31, at least two groups of the impact plates 33 are arranged on the planetary shaft 31, each group of the impact plates 33 includes at least two impact plates 33, and the impact plates 33 of each group are evenly arranged around the planetary shaft 31. Figure 6 In the embodiment, each group of the impact plates 33 is composed of four impact plates 33. Figure 6 , Figure 7 As shown, along the axis direction of the planetary shaft 31, the impact plates 33 of two adjacent groups can be arranged in a staggered or corresponding manner. Figure 6 As shown, preferably, the impact plates 33 of two adjacent groups are staggered along the axis direction of the planetary shaft 31. The above structure has the best effect on scraping and impacting the wall attached material, which can further improve the effect and efficiency of the ball mill and reduce the energy consumption of the ball mill.

Claims

1. An energy-saving ball mill with a built-in planetary impact mechanism, comprising a frame (1) and a barrel (2), wherein one end of the barrel (2) is provided with a feeding hollow shaft (21), and the other end is provided with a discharging hollow shaft (22), and the barrel (2) is rotatably mounted on the frame (1), characterized in that: It also comprises a fixed gear (4) and at least one impact mechanism (3) installed in the cylinder (2) and arranged around the axis of the cylinder (2) so as to be able to orbit around the axis of the cylinder (2) along with the cylinder (2); The impact mechanism (3) comprises a planetary shaft (31), the planetary shaft (31) is arranged along the axial direction of the cylinder (2), the planetary shaft (31) is rotatably connected to the cylinder (2), and an impact plate (33) is provided on the planetary shaft (31) for scraping, impacting and colliding with the wall-attached material in the cylinder (2); The fixed gear (4) is arranged at one end of the cylinder (2) and is coaxially arranged with the cylinder (2), and the fixed gear (4) is mounted and fixed on the frame (1); One end of the planetary shaft (31) close to the fixed gear (4) extends out of the cylinder (2) and is provided with a planetary gear (5) meshing with the fixed gear (4) to drive the planetary shaft (31) to rotate around its own axis.

2. An energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 1, characterized in that: The fixed gear (4) is an internal gear, and the planetary gear (5) is arranged inside the fixed gear (4) and meshes with the fixed gear (4).

3. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 1, characterized in that: The fixed gear (4) is an external gear, and the planetary gear (5) is arranged outside the fixed gear (4) and meshes with the outside of the fixed gear (4).

4. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 1, characterized in that: The frame (1) is provided with a box (11) which includes the fixed gear (4) and the planetary gear (5).

5. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 1, characterized in that: The cylinder (2) is rotatably connected to the frame (1) via a feeding hollow shaft (21) and a discharging hollow shaft (22) at both ends.

6. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 5, characterized in that: The feed hollow shaft (21) and the discharge hollow shaft (22) are rotatably connected to the frame (1) via spherical roller bearings (6) or spherical bearing bush bearings, and the planetary shaft (31) is rotatably connected to the cylinder (2) via the spherical roller bearings (6).

7. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 1, characterized in that: The distance between the planetary shaft (31) and the side wall of the cylinder (2) is smaller than the distance between the planetary shaft (31) and the axis of the cylinder (2).

8. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 1, characterized in that: There are at least two impact mechanisms (3), and the impact mechanisms (3) are evenly arranged around the axis of the cylinder (2).

9. An energy-saving ball mill with a built-in planetary impact mechanism as claimed in any one of claims 1 to 8, characterized in that: At least two groups of impact plates (33) are arranged on the planetary shaft (31) along the axial direction of the planetary shaft (31), each group of impact plates (33) comprises at least two impact plates (33), and each group of impact plates (33) is evenly arranged around the planetary shaft (31).

10. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 9, characterized in that: Each group of the impact plates (33) consists of four impact plates (33).

11. The energy-saving ball mill with a built-in planetary impact mechanism as claimed in claim 9, characterized in that: Along the axial direction of the planetary shaft (31), the impact plates (33) of two adjacent groups are arranged in a staggered manner.

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