Energy-saving ball mill with edge discharging function

Abstract

The utility model provides an energy-saving ball mill with edge discharge, which can be applied to a dry process and a wet grinding process, is particularly suitable for energy-saving grinding of powder with conventional fineness in the dry process, and aims to solve the problem that the ball mill cannot break through the limit rotating speed due to wall attachment so as to improve the grinding efficiency and effect. The utility model relates to the technical field of industrial powder preparation. The edge discharging energy-saving ball mill comprises a rack and a roller, the roller is rotationally installed on the rack, a center feeding hole is formed in one end of the roller, a discharging opening is formed in the side face of the other end of the roller, and a screening plate for screening materials is installed in the discharging opening; the ball mill further comprises an impact driving mechanism and at least one impact mechanism installed in the roller and arranged around the axis of the roller. The impact mechanism comprises a planet shaft, and an impact plate is arranged on the planet shaft; and the impact driving mechanism is in transmission connection with the planet shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial powder preparation, is suitable for dry grinding technology and wet grinding technology, is suitable for conventional powder and ultrafine powder production, and specifically is an edge-discharging energy-saving ball mill that is particularly suitable for conventional fineness powder production. 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 speed. To achieve the purpose of grinding, traditional ball mills require 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] 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.

[0008] 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.

[0009] 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 milled materials 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 cylinder rotation speed". Regardless of whether the reverse rotating device installed in the cylinder is coaxial with the cylinder, 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 the steel balls or between the steel balls and the materials, and improve the partial grinding efficiency; but it cannot achieve the purpose of "eliminating the centrifugal force of the steel balls" and "breaking through the critical limit of the cylinder rotation speed" as claimed in the patent application. Utility Model Content

[0010] The technical problem to be solved by the utility model is to provide an energy-saving ball mill with edge discharge that can be applied to both dry process and wet grinding process production, and is particularly suitable for energy-saving grinding of conventional fineness powder in dry process, so as to solve the problem that the ball mill cannot break through the limit speed due to wall attachment, so as to improve the grinding efficiency and effect, and reduce the energy consumption of the ball mill.

[0011] The utility model solves the technical problem by adopting the following technical solution: an energy-saving ball mill with edge discharging, comprising a frame and a cylinder, the cylinder being rotatably mounted on the frame, one end of the cylinder being provided with a central feed hole, the side of the other end being provided with a discharging port, a sieve plate for screening materials being installed in the discharging port;

[0012] The ball mill also includes an impact drive mechanism 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, and is rotatably connected to the cylinder so as to be able to rotate around its own axis. The planetary shaft is provided with an impact plate for scraping and impacting the wall-attached material in the cylinder;

[0014] The impact drive mechanism is in driving connection with the planetary shaft to drive the planetary shaft to rotate around its own axis.

[0015] Furthermore, the impact drive mechanism includes a fixed gear, which 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. The planetary shaft extends out of the cylinder at one end close to the fixed gear and is provided with a planetary gear that meshes 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, a feed hollow shaft is provided at one end of the cylinder, and a mounting shaft is provided at the other end. The mounting shaft and the feed hollow shaft are coaxially arranged with the cylinder, and the inner cavity of the feed hollow shaft forms the central feed hole. The cylinder is rotatably connected to the frame through the feed hollow shaft and the mounting shaft.

[0020] Furthermore, the feed hollow shaft and the mounting shaft are 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. Reduce the aspect ratio of the mill cylinder and reduce manufacturing difficulty

[0034] 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.

[0035] E. Reduce the overall mass of the grinding body and reduce the mass of the monomer

[0036] 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.

[0037] F. Adaptive speed

[0038] 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.

[0039] G. Convenient for wet grinding process production

[0040] The utility model retains the advantage of edge discharging of traditional ball mills and can be conveniently applied to wet grinding production.

[0041] H. Especially suitable for the production of conventional fine powders in dry grinding process

[0042] The utility model retains the advantages of the edge discharge of the traditional ball mill, and combined with the built-in planetary impact mechanism of the utility model, the utility model can be used for both conventional fineness production of dry process and ultra-fine powder production of dry process. Because the edge discharge fineness is coarse, the edge discharge process generally requires the configuration of a powder selection process equipment system. In order to reduce the powder selection cycle ratio, and combined with the high efficiency and energy saving advantages of the utility model, the utility model is particularly suitable for conventional fineness powder production. 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 1 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 6It 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-box, 21-center feed hole, 22-discharge port, 23-axis line, 24-feed hollow shaft, 25-installation shaft, 26-screen plate, 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, an energy-saving ball mill with edge discharge of the utility model comprises a frame 1 and a barrel 2, wherein the barrel 2 is rotatably mounted on the frame 1 so that the barrel 2 can rotate around its own axis, a central feed hole 21 is provided at one end of the barrel 2, and a discharge port 22 is provided on the side of the other end, wherein a sieve plate 26 for screening materials is installed in the discharge port 22. The ball mill also comprises an impact drive mechanism 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 comprises a planetary shaft 31, wherein 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 as to be able to rotate around its own axis, and an impact plate 33 is provided on the planetary shaft 31 for scraping, impacting and colliding the wall-attached materials in the barrel 2; the impact drive mechanism is transmission-connected with the planetary shaft 31 so as to drive the planetary shaft 31 to rotate around its own axis. The impact drive mechanism can be an electric motor, a hydraulic motor, etc. installed on the cylinder.

[0053] The screen plate 26 screens the material, specifically blocking the material with a particle size greater than the required size in the cylinder 2 to prevent it from flowing out through the discharge port 22. The screen plate 26 can be installed and fixed in the discharge port 22 by means of clamping, bolting, etc.

[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 impact driving mechanism drives the planetary shaft 31 to rotate around its own axis. Figure 4 He Ru Figure 5 As shown, the direction in which the driving mechanism drives the planetary shaft 31 to rotate can be the same as or opposite to the rotation direction of the cylinder 2. Figure 4 The rotation direction of the planetary shaft 31 is the same as the rotation direction of the cylinder. In the figure, the cylinder 2 rotates clockwise, and the planetary shaft 31 rotates clockwise. Figure 5 The rotation direction of the planetary shaft 31 is opposite to the rotation direction of the cylinder. In the figure, the cylinder 2 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 utility model 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 attached wall 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 driving mechanism drives the planetary shaft 31 to rotate around its own axis, and the planetary shaft 31 drives the impact plate to rotate during the self-rotation process. The rotating impact plate 33 scrapes and impacts the material grinding body in the entire B area, and the scraped part of the material grinding body in the B area is forced to move and impact the material grinding body in the adjacent C area, so that the material grinding body in the adjacent C area produces a chain reaction, eliminates the material grinding body attached to the wall in the C area, and then breaks through the limit of the 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, so that sufficient impact movement can be generated, 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. In addition, because the discharge port 22 of the utility model is arranged on the side of one end of the cylinder 2, the centrifugal force generated by the rotation of the cylinder can make the particles in the cylinder that meet the requirements pass through the sieve holes of the sieve plate and flow out from the discharge port 22, and the material can be discharged without the need for a feeding airflow, so it can be used for wet grinding. Of course, the ball mill is also suitable for the production of conventional powders.

[0056] It should be noted that, compared with the impact drive mechanism driving the planetary shaft 31 to rotate in the opposite direction to the rotation direction of the cylinder and the impact drive mechanism 32 driving the planetary shaft 31 to rotate in the same direction as the rotation direction of the cylinder, at 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 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] In the embodiment of the utility model, Figure 1 and Figure 2As shown, the impact drive mechanism includes a fixed gear 4, which is disposed at one end of the cylinder 2 and arranged coaxially with the cylinder 2, and the fixed gear 4 is mounted 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 meshing with the fixed gear 4 to drive the planetary shaft 31 to rotate around its own axis. Since the fixed gear 4 is fixed on the frame 1, the planetary shaft 31 revolves around the axis of the cylinder 2, and the planetary gear 5 meshing with the fixed gear 4 will revolve around the fixed gear 4 and rotate on its own axis, thereby driving the planetary shaft 31 to rotate around its own axis while the cylinder rotates. Specifically, as Figure 1 As shown, the fixed gear 4 may be 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, as shown in FIG. Figure 2 As shown, the fixed gear 4 may be an internal gear, and the planetary gear 5 is disposed inside the fixed gear 4 and meshes with the fixed gear 4. Figure 1 As 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; Figure 2 As shown, when the fixed gear 4 is an internal gear and the planetary gear 5 is disposed inside 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.

[0058] The impact drive mechanism adopts the above-mentioned fixed gear transmission structure, and can directly use the driving device of the cylinder to drive the planetary shaft to rotate. There is no need to set up a separate impact drive device to drive the planetary shaft to rotate, which is beneficial to controlling the manufacturing cost of the ball mill.

[0059] 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 impact mechanisms 3 can not only scrape and impact the material grinding bodies attached to the wall, but also produce secondary impacts and throw off the material grinding bodies dropped thereon, 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 2 In the embodiment, there are eight impact mechanisms 3 which are evenly arranged around the axis of the cylinder 2.

[0060] 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 corresponding fixed gear 4 and planetary gear 5 are selected according to the value.

[0061] 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 .

[0062] like Figure 1 As shown, one end of the cylinder 2 of the utility model is provided with a feed hollow shaft 24, and the other end is provided with a mounting shaft 25, the mounting shaft 25 and the feed hollow shaft 24 are both coaxially arranged with the cylinder 2, the inner cavity of the feed hollow shaft 24 forms the central feed hole 21, and the cylinder 2 is rotatably connected with the frame 1 through the feed hollow shaft 24 and the mounting shaft 25. The mounting shaft 25 and the feed hollow shaft 24 can be specifically arranged on the cylinder by bolt connection, welding or a structure that is integrated with the cylinder. In some embodiments, the cylinder 2 rotates with the frame 1 through the middle part between the feed hollow shaft 24 and the mounting shaft 25.

[0063] The feed hollow shaft 24 and the installation shaft 25 can be rotatably connected to the frame 1 through various bearings or bushings. In the present invention, preferably, the feed hollow shaft 24 and the installation shaft 25 are rotatably connected to the frame 1 through a spherical roller bearing 6 or a spherical bushing bearing to achieve automatic centering of the cylinder, simplify the manufacturing and installation accuracy of the ball mill, and improve the service life of the ball mill. The planetary shaft 31 can also be rotatably connected to the frame 1 through various bearings or bushings. In the present invention, preferably, the planetary shaft 31 is rotatably connected to the cylinder 2 through a spherical roller bearing 6 to achieve automatic centering of the planetary shaft and simplify the manufacturing and installation accuracy of the planetary shaft.

[0064] 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.

[0065] 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, 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 off the impact wall 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 edge discharging, comprising a frame (1) and a cylinder (2), wherein the cylinder (2) is rotatably mounted on the frame (1), characterized in that: A central feed hole (21) is provided at one end of the cylinder (2), and a discharge port (22) is provided on the side of the other end, wherein a sieve plate (26) for screening materials is installed in the discharge port (22); The ball mill further comprises an impact driving mechanism 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 axis direction of the cylinder (2), the planetary shaft (31) is rotatably connected to the cylinder (2) so as to be able to rotate around its own axis, and an impact plate (33) is provided on the planetary shaft (31) for scraping and impacting the wall material in the cylinder (2); The impact drive mechanism is in transmission connection with the planetary shaft (31) to drive the planetary shaft (31) to rotate around its own axis.

2. The energy-saving ball mill with edge discharging as claimed in claim 1, characterized in that: The impact drive mechanism comprises a fixed gear (4), the fixed gear (4) being arranged at one end of a cylinder (2) and being coaxially arranged with the cylinder (2), the fixed gear (4) being mounted and fixed on the frame (1), and the planetary shaft (31) extending out of the cylinder (2) at one end close to the fixed gear (4) and being provided with a planetary gear (5) meshing with the fixed gear (4) to drive the planetary shaft (31) to rotate around its own axis.

3. An energy-saving ball mill with edge discharge as claimed in claim 2, 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).

4. The energy-saving ball mill with edge discharging as claimed in claim 2, 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).

5. The energy-saving ball mill with edge discharging as claimed in claim 2, characterized in that: The frame (1) is provided with a box (11) which includes the fixed gear (4) and the planetary gear (5).

6. The energy-saving ball mill with edge discharging as claimed in claim 1, characterized in that: A feeding hollow shaft (24) is provided at one end of the cylinder (2), and a mounting shaft (25) is provided at the other end; the mounting shaft (25) and the feeding hollow shaft (24) are both coaxially arranged with the cylinder (2); the inner cavity of the feeding hollow shaft (24) forms the central feeding hole (21); and the cylinder (2) is rotatably connected to the frame (1) via the feeding hollow shaft (24) and the mounting shaft (25).

7. An energy-saving ball mill with edge discharge as claimed in claim 6, characterized in that: The feed hollow shaft (24) and the mounting shaft (25) are both rotatably connected to the frame (1) via a spherical roller bearing (6) or a spherical bush bearing, and the planetary shaft (31) is rotatably connected to the cylinder (2) via a spherical roller bearing (6).

8. The energy-saving ball mill with edge discharging 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).

9. The energy-saving ball mill with edge discharging 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).

10. An energy-saving ball mill with edge discharge according to any one of claims 1 to 9, 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).

11. The energy-saving ball mill with edge discharging as claimed in claim 10, characterized in that: Each group of the impact plates (33) consists of four impact plates (33).

12. The energy-saving ball mill with edge discharge as claimed in claim 10, 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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