Self-driven center continuous feeding structure and discharging structure of ball mill with over-limit rotating speed
By setting a self-driven guide cylinder and push structure in the hollow shaft of the feed and discharge of the ball mill, the problem of material wall attachment is solved, continuous production and efficient inlet and discharge of the ball mill are achieved at ultra-limit speeds, and the production efficiency and equipment life of the ball mill are improved.
Patent Information
- Application Number
- CN202421550317.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-02
AI Technical Summary
When traditional ball mills are above the limit speed, wall problems are easily caused by materials entering and exiting hollow shafts and exiting hollow shafts, resulting in difficulty in entering and exiting materials, affecting continuous production stability and equipment wear.
The self-drive center continuous feed structure and discharge structure of the ultra-limit speed ball mill are designed. By setting a rotatable feeding guide cylinder and discharge guide cylinder in the feed hollow shaft and the discharge hollow shaft, combined with the feed push structure and the reverse push structure, the continuous push of materials is achieved and the phenomenon of wall attachment is avoided.
The problem of wall attachment of ball mills above the limit speed is solved, the continuous production of ball mills at the extreme speed is ensured, production efficiency is improved, equipment wear is reduced, costs are reduced, and manufacturing process is simplified.
Smart Images
Figure CN223128191U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial powder preparation, in particular to a self-driven central continuous feeding structure and a discharging structure of an ultra-limit speed ball mill suitable for dry powder production, especially a self-driven central continuous feeding structure and a discharging structure of an ultra-limit speed ball mill suitable for dry ultra-fine powder production. Background Technique
[0002] The ball mill is a basic mechanical grinding equipment, which is widely used in industries such as metallurgy, building materials, and chemical engineering, especially in the grinding production of metallurgical ore dressing and building materials cement. The main reasons for the wide application of the ball mill are: First, excellent grinding performance, the powder granular material is nearly spherical, and the particle size distribution is reasonable; Second, continuous operation is stable and reliable; Third, the single-machine production capacity is large.
[0003] Since when the rotational speed of the cylinder reaches or exceeds the limit speed, the grinding medium and the material will remain relatively stationary with the cylinder and rotate together, resulting in a "wall attachment" motion state, which causes the material and the grinding medium in the ball mill not to collide and impact each other. Therefore, the rotational speed of the rotating cylinder of the traditional ball mill is lower than the limit (critical) speed (the rotational speed of the rotating cylinder is generally designed at 70-80% of the critical speed). The effective diameters of the feeding hollow shaft and the discharging hollow shaft of the traditional ball mill with central feeding and discharging are smaller than the effective diameter of the rotating cylinder. According to the limit (critical) speed formula n = 424 / √d (revolutions per minute, d is the effective inner diameter, unit: cm), the limit (critical) speed of the feeding hollow shaft and the discharging hollow shaft is higher than that of the rotating cylinder. Therefore, there is no problem of material and grinding medium wall attachment in the feeding hollow shaft and the discharging hollow shaft. Limited by the limit speed, the production efficiency of the traditional ball mill is low. Therefore, how to solve the wall attachment problem of the ball mill breaking through the limit speed limit and making the ball mill not limited by the limit speed is the key to improving the production efficiency of the ball mill.
[0004] With the progress of technology, it has become possible to improve the efficiency of the ball mill by improving the ball mill to break through the limit speed limit of the ball mill. Such as: Figure 1As shown in the figure, the applicant has designed a ball mill with central feeding and discharging, which includes a frame 1 and a cylinder 2. One end of the cylinder 2 is provided with a feeding hollow shaft 21, and the other end is provided with a discharging hollow shaft 22. The cylinder 2 is rotatably installed on the frame 1 so that the cylinder 2 can rotate around its own axis; it also includes at least one impact mechanism 3 installed in the cylinder 2 and arranged around the axis of the cylinder 2 to revolve around the axis of the cylinder 2 with the cylinder 2. The impact mechanism 3 includes 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 that the planetary shaft 31 can rotate around its own axis, that is, rotate self - sufficiently. An impact plate 33 for scraping the wall - attached materials in the cylinder 2 is provided on the planetary shaft 31. In the figure, the planetary shaft 31 is driven by a fixed gear 4. The fixed gear 4 is arranged at one end of the cylinder 2 and coaxially arranged with the cylinder 2. The fixed gear 4 is fixedly installed 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. During the rotation of the cylinder of this ball mill, while driving the planetary shaft 31 to rotate around the axis of the cylinder 2, it realizes self - rotation around its own axis through the planetary gear 5 and the fixed gear 4. During the rotation of the planetary shaft 31, the impact plate 33 is driven to rotate together. During the rotation of the impact plate 33, the wall - attached materials and grinding bodies in the trajectory area of the impact plate 33 are scraped and impacted, and the wall - attached materials and grinding bodies in the nearby area are also impacted and removed, thereby eliminating the wall - attached materials, enabling the materials and grinding bodies to effectively impact inside the cylinder 2, and realizing grinding under the condition of breaking through the critical speed.
[0005] However, when the ball mill breaks through the critical speed, with the increase of the cylinder speed, especially when the feeding hollow shaft and the discharging hollow shaft of the cylinder exceed the critical speed, during the process of the material passing through the feeding hollow shaft and the discharging hollow shaft, the wall - attached problem will also occur under the action of the cylinder rotation, resulting in difficulties in feeding and discharging during the operation of the ball mill, easy blockage of materials, and affecting the continuous production stability of the ball mill.
[0006] In order to eliminate the wall - attached materials in the feeding hollow shaft and the discharging hollow shaft, it is easy to think of simply setting rotatable spiral pushing structures respectively in the feeding hollow shaft and the discharging hollow shaft that are rotationally matched with them. However, due to the still existing wall - attached phenomenon, the materials will tightly adhere to the inner walls of the feeding hollow shaft and the discharging hollow shaft and accumulate under the action of centrifugal force. For central feeding, the frictional force between the material and the feeding hollow shaft will be very large, which will cause the spiral pushing structure to be difficult to push the material, and easily lead to problems such as wear and damage of the spiral pushing structure and the feeding hollow shaft; for central discharging, in addition to the problems of central feeding, there are also difficulties in separating and conveying coarse and fine materials. Utility Model Content
[0007] The technical problem to be solved by the present utility model is to provide a self-driven central continuous feeding structure and a discharging structure for an ultra-limit speed ball mill, so as to solve the problem of material wall attachment when the material enters and exits the ball mill after the ball mill exceeds the limit speed.
[0008] The technical solution adopted by the present utility model to solve its technical problem is: a self-driven central continuous feeding structure and a discharging structure for an ultra-limit speed ball mill. The ball mill includes a frame and a cylinder body. One end of the cylinder body is provided with a feeding hollow shaft, and the other end is provided with a discharging hollow shaft. The cylinder body is rotatably installed on the frame. A feeding guide cylinder rotatably matched with the feeding hollow shaft is arranged inside the feeding hollow shaft, and a discharging guide cylinder rotatably matched with the discharging hollow shaft is arranged inside the discharging hollow shaft.
[0009] The outer end of the feeding guide cylinder extends out of the feeding hollow shaft and is fixedly connected with the frame. A feeding central shaft coaxial with and rotatable inside the feeding guide cylinder is arranged inside the feeding guide cylinder. The feeding central shaft is fixedly connected with the cylinder body. A feeding pushing structure for pushing the material in the feeding guide cylinder into the cylinder body by cooperating with the inner wall of the feeding guide cylinder is arranged on the feeding central shaft.
[0010] The outer end of the discharging guide cylinder extends out of the discharging hollow shaft and is fixedly connected with the frame. A discharging central shaft coaxial with and rotatable inside the discharging guide cylinder is arranged inside the discharging guide cylinder. The discharging central shaft is fixedly connected with the cylinder body. A reverse pushing structure for pushing the sinking material in the discharging guide cylinder into the cylinder body by cooperating with the inner wall of the discharging guide cylinder is arranged on the discharging central shaft.
[0011] Further, the feeding pushing structure includes at least one feeding spiral belt wound around the feeding central shaft. A gap is provided between the feeding spiral belt and the feeding central shaft. The feeding spiral belt is fixed on the feeding central shaft through a first support.
[0012] Further, the reverse pushing structure includes at least one reverse pushing spiral belt wound around the discharging central shaft. A gap is provided between the reverse pushing spiral belt and the discharging central shaft. The reverse pushing spiral belt is fixed on the discharging central shaft through a second support. The spiral direction of the reverse pushing spiral belt is opposite to that of the feeding spiral belt.
[0013] Further, a hollow feeding transition section is provided between the inner cavity of the feeding hollow shaft and the cylinder body. The inner cavity of the feeding transition section is of a frustum-shaped structure. The small end of the feeding transition section is connected with the inner end of the feeding hollow shaft.
[0014] Further, the inner cavity cone angle of the feeding transition section is greater than 80°, and preferably takes a value of 90°.
[0015] Further, the feeding central shaft is fixed on the inner wall of the feeding transition section through a first rib plate.
[0016] Further, a hollow discharge transition section is provided between the inner cavity of the cylinder body and the discharge hollow shaft. The inner cavity of the discharge transition section is in a frustum-shaped structure, and the small end of the discharge transition section is connected to the inner end of the discharge hollow shaft.
[0017] Further, the included angle of the inner cavity of the discharge transition section is greater than 80°, and preferably takes a value of 90°.
[0018] Further, the discharge central shaft is fixed to the inner wall of the discharge transition section through a second rib plate.
[0019] Further, an extended section of the feed spiral belt extending beyond the inner end of the feed guide cylinder is provided at the inner end of the feed spiral belt. The length of the extended section of the feed spiral belt is preferably 10 - 20 mm.
[0020] Further, an extended section of the reverse push spiral belt extending beyond the inner end of the feed guide cylinder is provided at the inner end of the reverse push spiral belt. The length of the extended section of the reverse push spiral belt is preferably 10 - 20 mm.
[0021] Further, a feed negative pressure sealing channel for introducing external air into the cylinder body is formed by the gap between the outer wall of the feed guide cylinder and the inner wall of the feed hollow shaft. The gap between the outer wall of the feed guide cylinder and the inner wall of the feed hollow shaft is preferably 2 - 3 mm;
[0022] A discharge negative pressure sealing channel for introducing external air into the cylinder body is formed by the gap between the outer wall of the discharge guide cylinder and the inner wall of the discharge hollow shaft. The gap between the outer wall of the discharge guide cylinder and the inner wall of the discharge hollow shaft is preferably 2 - 3 mm.
[0023] Further, an extended section of the feed extending beyond the inner end of the feed hollow shaft is provided at the inner end of the feed guide cylinder. The length of the extended section of the feed is preferably 5 - 10 mm.
[0024] Further, an extended section of the discharge extending beyond the inner end of the discharge hollow shaft is provided at the inner end of the discharge guide cylinder. The length of the extended section of the discharge is preferably 5 - 10 mm.
[0025] The beneficial effects of the present utility model are:
[0026] The self-driving central continuous feeding structure and discharging structure of the ultra-limit speed ball mill of the present utility model. Inside the feeding hollow shaft 21, there is a feeding guide cylinder 7 fixedly connected to the frame. Inside the feeding guide cylinder 7, there is a feeding central shaft 71 fixedly connected to the cylinder body. The feeding central shaft 71 is provided with a feeding pushing structure. Inside the discharging hollow shaft 22, there is a discharging guide cylinder 8 fixedly connected to the frame. Inside the discharging guide cylinder 8, there is a discharging central shaft 81 fixedly connected to the cylinder body. The discharging central shaft 81 is provided with a reverse pushing structure. During the working rotation of the cylinder body, it will not drive the feeding guide cylinder and the discharging guide cylinder to rotate, but will drive the feeding pushing structure and the reverse pushing structure to rotate. Therefore, there will be no problem of material adhering to the wall during feeding and discharging, and the problem of material adhering to the wall during feeding and discharging is transformed into a simple problem of material accumulation during feeding and discharging, which is convenient for pushing the material in the feeding guide cylinder and the sinking material in the discharging guide cylinder into the drum. During the rotation of the feeding pushing structure, the wall-adhering material in the feeding guide cylinder 7 can be pushed into the cylinder body. During the rotation of the reverse pushing structure, the coarser material sinking on the inner wall of the discharging guide cylinder 8 can be pushed reversely into the cylinder body. Therefore, the present utility model solves the problem of material adhering to the wall when the mill exceeds the limit speed, especially when it exceeds the limit speed of the feeding hollow shaft and the discharging hollow shaft, can ensure the continuous production of the ultra-limit speed ball mill, improve the production efficiency of the ball mill, and make the feeding and discharging of the ball mill more convenient, and the feeding and discharging structure is not easy to wear and damage.
[0027] Both the feeding hollow shaft and the discharging hollow shaft are self-driven by the cylinder body, and there is no need to additionally set up an independent driving device, which is beneficial to controlling the cost of the ball mill.
[0028] The external driving central continuous feeding and discharging structure of the ultra-limit speed ball mill of the present utility model. Between the cylinder body 2 and the feeding hollow shaft 21 and the discharging hollow shaft 22, there are fixedly arranged a feeding transition section 23 and a discharging transition section 24 with a frustum structure. Its main beneficial effects are: increasing the structural strength of the cylinder body 2, the feeding hollow shaft 21 and the discharging hollow shaft 22; shortening the lengths of components such as the feeding hollow shaft 21, the discharging hollow shaft 22, the feeding guide cylinder 7, the discharging guide cylinder 8, the feeding central shaft 71, the discharging central shaft 81, etc., simplifying and facilitating manufacturing, and at the same time reducing the collision and wear of the internal material crushing and grinding of the cylinder body 2 on the central feeding and discharging structure. Description of the Drawings
[0029] Figure 1 is a structural schematic diagram of the prior art;
[0030] Figure 2 is a structural schematic diagram of the present utility model;
[0031] Figure 3 is a structural schematic diagram of a feeding pushing structure;
[0032] Figure 4 is Figure 3 a cross-sectional view along A-A;
[0033] Figure 5 is Figure 3 an enlarged view of part B of
[0034] Figure 6 a structural schematic diagram of the reverse pushing structure;
[0035] Figure 7 is Figure 6 an enlarged view of part C of
[0036] Figure 8 a structural schematic diagram of a feeding pushing structure;
[0037] As shown in the figure: 1-frame, 2-barrel, 3-impact mechanism, 4-fixed gear, 5-planetary gear, 7-feeding guide cylinder, 8-discharging guide cylinder, 21-feeding hollow shaft, 22-discharging hollow shaft, 23-feeding transition section, 24-discharging transition section, 31-planetary shaft, 33-impact plate, 71-feeding central shaft, 72-feeding spiral belt, 73-first support, 74-feeding extension section, 75-discharging negative pressure sealing channel, 76-feeding port, 77-arc plate, 78-first rib plate, 81-discharging central shaft, 82-reverse pushing spiral belt, 83-second support, 84-discharging extension section, 85-discharging negative pressure sealing channel, 86-discharging port, 87-second rib plate, 721-feeding spiral belt extension section, 821-reverse pushing spiral belt extension section. Specific Embodiments
[0038] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] As Figure 1 and Figure 2As shown in the figure, the ball mill of the present utility model includes a frame 1 and a cylinder body 2. One end of the cylinder body 2 is provided with a feed hollow shaft 21, and the other end is provided with a discharge hollow shaft 22. The cylinder body 2 is rotatably installed on the frame 1. The ball mill of the present utility model further includes a planetary shaft self-rotation driving mechanism and at least one impact mechanism 3 installed in the cylinder body 2 and arranged around the axis of the cylinder body 2 so as to be able to revolve around the axis of the cylinder body 2 with the cylinder body 2. The impact mechanism 3 includes a planetary shaft 31. The planetary shaft 31 is arranged along the axis direction of the cylinder body 2. The planetary shaft 31 is rotatably connected to the cylinder body 2 so that the planetary shaft 31 can rotate around its own axis, that is, rotate self. An impact plate 33 for scraping the wall-attached material in the cylinder body 2 is provided on the planetary shaft 31. The planetary shaft self-rotation driving mechanism can be a motor. In the figure, the planetary shaft self-rotation driving mechanism includes a fixed gear 4. The fixed gear 4 is arranged at one end of the cylinder body 2 and is arranged coaxially with the cylinder body 2. The fixed gear 4 is fixedly installed on the frame 1. One end of the planetary shaft 31 close to the fixed gear 4 extends out of the cylinder body 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. The fixed gear 4 can be an external gear or an internal gear. In order to solve the problem that when the ball mill breaks through the limit speed, as the rotation speed of the cylinder body increases, especially when the rotation speed of the cylinder body exceeds the limit speed of the feed hollow shaft 21 and the discharge hollow shaft 22, the material will also be affected by the rotation of the cylinder body during the process of passing through the feed hollow shaft 21 and the discharge hollow shaft 22 and generate wall attachment, the present utility model is provided with a self-driven central continuous feeding structure and a discharge structure on the ball mill. Specifically, the self-driven central continuous feeding structure and the discharge structure are as Figure 2 shown. A feed guiding cylinder 7 rotatably matched with the feed hollow shaft 21 is arranged in the feed hollow shaft 21. A discharge guiding cylinder 8 rotatably matched with the discharge hollow shaft 22 is arranged in the discharge hollow shaft 22. The outer end of the feed guiding cylinder 7 extends out of the feed hollow shaft 21 and is fixedly connected to the frame 1. A feed central shaft 71 coaxial with and rotatable in the feed guiding cylinder 7 is arranged in the feed guiding cylinder 7, so that the feed central shaft 71 can rotate around its own axis in the feed guiding cylinder 7. The feed central shaft 71 is fixedly connected to the cylinder body 2. A feed pushing structure for pushing the material in the feed guiding cylinder 7 into the cylinder body 2 by cooperating with the inner wall of the feed guiding cylinder 7 is arranged on the feed central shaft 71. The outer end of the discharge guiding cylinder 8 extends out of the discharge hollow shaft 22 and is fixedly connected to the frame 1. A discharge central shaft 81 coaxial with and rotatable in the discharge guiding cylinder 8 is arranged in the discharge guiding cylinder 8, so that the discharge central shaft 81 can rotate around its own axis in the discharge guiding cylinder 8. The discharge central shaft 81 is fixedly connected to the cylinder body 2. A reverse pushing structure for pushing the sinking material in the discharge guiding cylinder 8 into the cylinder body 2 by cooperating with the inner wall of the discharge guiding cylinder 8 is arranged on the discharge central shaft 81.
[0040] The fixed connection in the utility model can adopt various conventional fixed connection methods such as bolt connection, welding, etc.
[0041] The feed inlet 76 of the feed guide tube 7 can be arranged on the end face or side face of the feed guide tube 7, and the discharge outlet 86 of the discharge guide tube 8 can also be arranged on the end face or side face of the discharge guide tube 8. In the present invention, the feed inlet 76 of the feed guide tube 7 is arranged on the upper side face of the feed guide tube 7, and the discharge outlet 86 of the discharge guide tube 8 is arranged on the upper side face of the discharge guide tube 8 (see Figure 2 ).
[0042] When the ball mill is working, the cylinder is driven to rotate around its own axis by the cylinder driving device, and the air inlet end of the pneumatic conveying device is connected to the discharge port of the discharge guide cylinder 8 to evacuate the inside of the cylinder 2 to generate a feeding airflow.
[0043] In order to better understand the function of the utility model, it is necessary to explain the central feeding and discharging principle of the utility model. Figure 2 , Figure 3 and Figure 6 As shown, during the material processing, the material enters the feed guide tube 7 from the feed port 76 of the feed guide tube 7, and is pushed into the cylinder body by the rotation of the feed push structure. At the same time, the feed guide tube 7 continuously enters the required amount of air for discharge; the material is continuously crushed and ground inside the cylinder 2. During the crushing and grinding process, the fine powder is continuously brought into the discharge guide tube 8 by the air with a certain flow rate inside the cylinder 2 in the state of gas-powder mixture, and discharged through the discharge port 86. In order to reduce the amount of air conveyed by the gas-powder mixture (also to reduce the conveying energy consumption and the amount of dust-containing gas purification and environmental protection treatment), the gas flow rate in the utility model is used as low as possible on the premise of satisfying the conveying of qualified fine powder. During the grinding process inside the cylinder 2, a small part of the material and grinding body close to the feeding direction may also enter the feed guide tube 7 due to collision, and in the same principle, they are pushed back to the cylinder 2 by the central feeding structure. A small part of the coarse material and grinding body close to the discharge direction may also enter the discharge guide tube 8 due to collision, and in the same principle, they are pushed back to the cylinder 2 by the reverse push structure. During the discharging process, a small amount of relatively coarse-grained powder will be separated by gravity and sink to the bottom of the discharging guide tube 8. This part of the deposited powder is pushed into the tube by the reverse pushing structure. Therefore, it is obvious that the external drive center continuous feeding and discharging structure of the ultra-limiting speed ball mill of the utility model is suitable for dry production. Based on the reasons of reducing energy consumption, reducing the circulation rate of powder selection (the powder discharged from the mill generally needs to be separated into qualified powder through powder selection) and reducing the dust-containing air purification and environmental protection treatment volume, the utility model is particularly suitable for the production of dry ultra-fine powder.
[0044] Specifically, Figure 3As shown in the figure, in the present utility model, the feeding and pushing structure includes at least one feeding spiral belt 72 wound around the feeding central axis 71. A space is provided between the feeding spiral belt 72 and the feeding central axis 71 to allow air flow and materials to enter the cylinder. The feeding spiral belt 72 is fixed to the feeding central axis 71 through the first support 73. Since the feeding spiral belt 72 is driven by the cylinder through the feeding central axis 71 to push the materials in the feeding guide cylinder 7 into the cylinder 2, the specific helix direction of the feeding spiral belt 72 should be set according to the rotation direction of the cylinder during operation. Specifically, when the cylinder rotates clockwise, the feeding spiral belt is left-handed; when the cylinder rotates counterclockwise, the feeding spiral belt is right-handed. As Figure 8 shown, in some embodiments, the feeding and pushing structure also adopts a structure in which multiple arc-shaped plates 77 are provided on the feeding central axis 71. The arc-shaped plates 77 are inclined with respect to the axis of the feeding central axis 71. The inclination direction of the arc-shaped plates 77 is also set according to the rotation direction of the cylinder during operation, and the specific principle is the same as the above principle and will not be elaborated specifically.
[0045] Specifically, as Figure 6 shown, the reverse pushing structure includes at least one reverse pushing spiral belt 82 wound around the discharge central axis 81. A space is provided between the reverse pushing spiral belt 82 and the discharge central axis 81 to facilitate the flow of air and materials out. The reverse pushing spiral belt 82 is fixed to the discharge central axis 81 through the second support 83. Since the reverse pushing spiral belt 82 is driven by the cylinder through the discharge central axis 81 to push the sinking materials in the discharge guide cylinder 8 into the cylinder 2, the specific helix direction of the reverse pushing spiral belt 82 should also be set according to the rotation direction of the cylinder during operation. Specifically, the helix direction of the reverse pushing spiral belt 82 is opposite to that of the feeding spiral belt 72, that is, when the cylinder rotates clockwise, the reverse pushing spiral belt is right-handed; when the cylinder rotates counterclockwise, the reverse pushing spiral belt is left-handed. In some embodiments, the reverse pushing structure also adopts a structure in which multiple arc-shaped plates are provided on the discharge central axis, and the arc-shaped plates are inclined with respect to the axis of the discharge central axis.
[0046] The feeding hollow shaft 21 and the inner wall of the cylinder can be directly transitioned at 90°. The inner wall of the cylinder and the discharge hollow shaft 22 can also be directly transitioned at 90°. As Figure 2As shown, in the present utility model, a hollow feed transition section 23 is provided between the inner cavity of the feed hollow shaft 21 and the inner cavity of the cylinder body 2. The inner cavity of the feed transition section 23 is of a frustum-shaped structure, and the small end of the feed transition section 23 is connected to the inner end of the feed hollow shaft 21; a hollow discharge transition section 24 is provided between the inner cavity of the cylinder body 2 and the discharge hollow shaft 22. The inner cavity of the discharge transition section 24 is also of a frustum-shaped structure, and the small end of the discharge transition section 24 is connected to the inner end of the discharge hollow shaft 22. In this way, after the material passes through the feed guide cylinder 7, it will first slide along the inclined surface formed on the inner cavity surface of the feed transition section 23 and then enter the cylinder body, which can make the incoming material fall at the very front end of the cylinder body, facilitating the processing of the material. After the discharge transition section 24 is provided, the smaller particles of the material can more easily flow out from the discharge guide cylinder 8 under the action of the air flow, which is beneficial to the discharge of the material. At the same time, it is also convenient for the coarser material pushed back by the reverse pushing structure to slide down again along the inclined surface formed in the inner cavity of the discharge transition section and enter the cylinder body. It can be understood that the inner cavity taper angles of the feed transition section 23 and the discharge transition section 24 should enable the material to slide down along them into the cylinder body during the rotation of the cylinder body without adhering to it. Generally speaking, the inner cavity taper angles of the feed transition section 23 and the discharge transition section 24 are greater than 80°. However, due to the excessively large inner cavity taper angles of the feed transition section 23 and the discharge transition section 24, the feed pushing mechanism and the discharge pushing mechanism will inevitably be lengthened, which will bring negative impacts such as reduced structural strength of the feed pushing structure and the discharge pushing structure, increased manufacturing difficulty, and severe collision and wear with the material grinding body. Therefore, the inner cavity taper angles of the feed transition section 23 and the discharge transition section 24 are preferably 90°.
[0047] For the convenience of feeding and discharging and the processing of the material, in the present utility model, preferably, the feed central shaft 71 is fixed to the inner wall of the feed transition section 23 through the first rib plate 78 to achieve fixed connection with the cylinder body, and the discharge central shaft 81 is fixed to the inner wall of the discharge transition section 24 through the second rib plate 87 to achieve fixed connection with the cylinder body.
[0048] The inner end of the feed spiral belt 72 can extend inwards to exceed the inner end of the feed guide cylinder 7, or of course, it can also not exceed the inner end of the feed guide cylinder 7. As Figure 5 shown, for the convenience of feeding, the inner end of the feed spiral belt 72 is provided with a feed spiral belt extension section 721 that exceeds the inner end of the feed guide cylinder 7. The length of the feed spiral belt extension section 721 can be set as required. However, if the feed spiral belt extension section 721 is too long, it will reduce the structural strength of the feed spiral belt extension section 721 and increase its collision and wear with the material grinding body inside the cylinder body 2. Therefore, in the present utility model, the length of the feed spiral belt extension section 721 is preferably 10 - 20 mm.
[0049] For the convenience of pushing the sunken material into the drum, as Figure 7As shown, in the present utility model, an extended section 821 of the reverse-thrust spiral belt 82 is provided at the inner end of the reverse-thrust spiral belt 82, which extends beyond the inner end of the feed guiding cylinder 7. The length of the extended section 821 of the reverse-thrust spiral belt can be set as required. However, if the extended section 821 of the reverse-thrust spiral belt is too long, it will reduce the structural strength of the extended section 821 of the reverse-thrust spiral belt and increase the grinding collision wear between it and the materials inside the cylinder body 2. Therefore, in the present utility model, the length of the extended section 821 of the reverse-thrust spiral belt is preferably 10 - 20 mm.
[0050] In the present utility model, in order to prevent dust and the like inside the cylinder from entering the gap between the feed guiding cylinder 7 and the feed hollow shaft 21, which may affect the rotation of the cylinder body, a feed negative-pressure sealing channel 85 for introducing outside air into the cylinder body 2 is formed between the outer wall of the feed guiding cylinder 7 and the inner wall of the feed hollow shaft 21. That is, one end of the feed negative-pressure sealing channel 85 communicates with the outside, and the other end communicates with the inner cavity of the cylinder body. In this way, under the action of the negative pressure inside the cylinder body, the outside air can enter the cylinder body through the feed negative-pressure sealing channel 85, thereby preventing dust and the like inside the cylinder from entering the gap between the feed guiding cylinder 7 and the feed hollow shaft 21. The gap between the outer wall of the feed guiding cylinder 7 and the inner wall of the feed hollow shaft 21 is generally 1 - 5 mm. However, if the value of this gap is too small, it will increase the manufacturing precision and manufacturing cost of the feed hollow shaft 21 and the feed guiding cylinder 7; if the value of the gap is too large, large particles of materials are likely to enter the gap, affecting the negative-pressure air flow sealing. Therefore, in the present utility model, it is preferably 2 - 3 mm.
[0051] Similarly, in order to prevent dust and the like inside the cylinder from entering the gap between the discharge guiding cylinder 8 and the discharge hollow shaft 22, which may affect the rotation of the cylinder body, a discharge negative-pressure sealing channel 85 for introducing outside air into the cylinder body 2 is formed between the outer wall of the discharge guiding cylinder 8 and the inner wall of the discharge hollow shaft 22. That is, one end of the discharge negative-pressure sealing channel 85 communicates with the outside, and the other end communicates with the inner cavity of the cylinder body. In this way, under the action of the negative pressure inside the cylinder body, the outside air can enter the cylinder body through the discharge negative-pressure sealing channel 85, thereby preventing dust and the like inside the cylinder from entering the gap between the discharge guiding cylinder 8 and the discharge hollow shaft 22. The gap between the outer wall of the discharge guiding cylinder 8 and the inner wall of the discharge hollow shaft 22 is generally 1 - 5 mm. However, if the value of this gap is too small, it will increase the manufacturing precision and manufacturing cost of the feed hollow shaft 21 and the feed guiding cylinder 7; if the value of the gap is too large, large particles of materials are likely to enter the gap, affecting the negative-pressure air flow sealing. In the present utility model, it is preferably 2 - 3 mm.
[0052] The inner end of the feed guiding cylinder 7 can extend inwards to exceed the inner end of the feed hollow shaft 21, or of course, it can also not exceed the inner end of the feed hollow shaft 21. For example Figure 5As shown, in order to facilitate feeding, an inner end of the feeding guide cylinder 7 is provided with a feeding extension section 74 that extends beyond an inner end of the feeding hollow shaft 21, that is, the inner end of the feeding guide cylinder 7 extends beyond the inner end of the feeding hollow shaft 21. The length of the feeding extension section 74 can be set arbitrarily according to needs. However, practice shows that if the feeding extension section 74 is too long, especially after a feeding transition section 23 is provided, the material is likely to get stuck between the stationary feeding guide cylinder 7 and the rotating feeding transition section 23, causing strong frictional wear and damage to the feeding guide cylinder 7 and the feeding transition section 23; if the feeding extension section 74 is too short, the negative pressure sealed air intake gap channel between the feeding guide cylinder 7 and the feeding hollow shaft 21 will be damaged. Therefore, in the present utility model, the length of the feeding extension section 74 is preferably 5-10 mm.
[0053] The inner end of the discharging guide cylinder 8 can extend inward to exceed the inner end of the discharging hollow shaft 22, and of course it can also not exceed the inner end of the discharging hollow shaft 22. As Figure 7 shown, in the present utility model, the inner end of the discharging guide cylinder 8 is provided with a discharging extension section 84 that extends beyond the inner end of the discharging hollow shaft 22, that is, the inner end of the discharging guide cylinder 8 extends beyond the inner end of the discharging hollow shaft 22. The discharging extension section 84 can be set arbitrarily according to needs. However, practice shows that if the discharging extension section 84 is too long, especially after a discharging transition section 24 is provided, the material is likely to get stuck between the stationary discharging guide cylinder 8 and the rotating discharging transition section 24, causing strong frictional wear and damage to the discharging guide cylinder 8 and the discharging transition section 24, and if the discharging extension section 84 is too short, the negative pressure sealed air intake gap passage between the discharging guide cylinder 8 and the discharging hollow shaft 22 will be damaged. Therefore, in the present utility model, the length of the discharging extension section 84 is preferably 5-10 mm.
Claims
1. Self-driven central continuous feeding structure and discharging structure of an ultra-high speed ball mill. The ball mill includes a frame (1) and a cylinder body (2). One end of the cylinder body (2) is provided with a feeding hollow shaft (21), and the other end is provided with a discharging hollow shaft (22). The cylinder body (2) is rotatably installed on the frame (1), and is characterized in that: A feed hollow shaft (21) is provided with a feed guide cylinder (7) rotatably engaged with the feed hollow shaft (21), and a discharge hollow shaft (22) is provided with a discharge guide cylinder (8) rotatably engaged with the discharge hollow shaft (22). The outer end of the feed guide cylinder (7) extends out of the feed hollow shaft (21) and is fixedly connected to the frame (1); a feed central shaft (71) coaxial with and rotatable within the feed guide cylinder (7) is provided within the feed guide cylinder (7), the feed central shaft (71) is fixedly connected to the cylinder body (2), and a feed pushing structure for pushing the material within the feed guide cylinder (7) into the cylinder body (2) by cooperating with the inner wall of the feed guide cylinder (7) is provided on the feed central shaft (71). The outer end of the discharge guide cylinder (8) extends out of the discharge hollow shaft (22) and is fixedly connected to the frame (1), a discharge central shaft (81) coaxial with and rotatable within the discharge guide cylinder (8) is provided within the discharge guide cylinder (8), the discharge central shaft (81) is fixedly connected to the cylinder body (2), and a reverse pushing structure for pushing the sinking material within the discharge guide cylinder (8) into the cylinder body (2) by cooperating with the inner wall of the discharge guide cylinder (8) is provided on the discharge central shaft (81).
2. The self-driving central continuous feeding structure and discharging structure of the ultra-limiting speed ball mill according to claim 1, characterized in that: The feed pushing structure includes at least one feed spiral band (72) wound around the feed central shaft (71), a gap is provided between the feed spiral band (72) and the feed central shaft (71), and the feed spiral band (72) is fixed to the feed central shaft (71) by a first support (73).
3. The self-driving central continuous feeding structure and discharging structure of the ultra-limited speed ball mill according to claim 2, characterized in that: The reverse pushing structure includes at least one reverse pushing spiral band (82) wound around the discharge central shaft (81), a gap is provided between the reverse pushing spiral band (82) and the discharge central shaft (81), the reverse pushing spiral band (82) is fixed to the discharge central shaft (81) by a second support (83), and the spiral direction of the reverse pushing spiral band (82) is opposite to that of the feed spiral band (72).
4. The self-driven central continuous feeding structure and discharging structure of the ultra-limited speed ball mill according to claim 1, characterized in that: A hollow feed transition section (23) is provided between the inner cavity of the feed hollow shaft (21) and the cylinder body (2), the inner cavity of the feed transition section (23) is of a frustum-shaped structure, and the small end of the feed transition section (23) is connected to the inner end of the feed hollow shaft (21).
5. The self-driven central continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 4, characterized in that: The inner cavity cone angle of the feed transition section (23) is greater than 80°, preferably 90°.
6. The self-driving central continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 4, characterized in that: The feed central shaft (71) is fixed to the inner wall of the feed transition section (23) by a first rib plate (78).
7. The self-driving central continuous feeding structure and discharging structure of the ultra-limited speed ball mill according to claim 1, characterized in that: A hollow discharge transition section (24) is provided between the inner cavity of the cylinder body (2) and the discharge hollow shaft (22), the inner cavity of the discharge transition section (24) is of a frustum-shaped structure, and the small end of the discharge transition section (24) is connected to the inner end of the discharge hollow shaft (22).
8. The self-driven central continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 7, characterized in that: The cone angle of the discharge transition section (24) is greater than 80°, preferably 90°.
9. The self-driven central continuous feeding structure and discharging structure of the ultra-limiting speed ball mill according to claim 7, characterized in that: The discharge central shaft (81) is fixed to the inner wall of the discharge transition section (24) by a second rib plate (87).
10. The self-driven central continuous feeding structure and discharging structure of the ultra-limited speed ball mill according to claim 2, characterized in that: The inner end of the feed screw belt (72) is provided with a feed screw belt extension section (721) that exceeds the inner end of the feed guide cylinder (7), and the length of the feed screw belt extension section (721) is preferably 10-20 mm.
11. The self-driven central continuous feeding structure and discharging structure of the ultra-high speed ball mill according to claim 3, characterized in that: The inner end of the reverse push screw belt (82) is provided with a reverse push screw belt extension section (821) that exceeds the inner end of the feed guide cylinder (7), and the length of the reverse push screw belt extension section (821) is preferably 10-20 mm.
12. The self-driven central continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 1, characterized in that: The gap between the outer wall of the feed guide cylinder (7) and the inner wall of the feed hollow shaft (21) forms a feed negative pressure sealing channel (75) that can introduce external air into the cylinder body (2), and the gap between the outer wall of the feed guide cylinder (7) and the inner wall of the feed hollow shaft (21) is preferably 2-3 mm; The gap between the outer wall of the discharge guide cylinder (8) and the inner wall of the discharge hollow shaft (22) forms a discharge negative pressure sealing channel (85) that introduces external air into the cylinder body (2), and the gap between the outer wall of the discharge guide cylinder (8) and the inner wall of the discharge hollow shaft (22) is preferably 2-3 mm.
13. The self-driven central continuous feeding structure and discharging structure of the ultra-limited speed ball mill according to any one of claims 1 to 12, characterized in that: The inner end of the feed guide cylinder (7) is provided with a feed extension section (74) that exceeds the inner end of the feed hollow shaft (21), and the length of the feed extension section (74) is preferably 5-10 mm.
14. The self-driving central continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to any one of claims 1 to 12, characterized in that: The inner end of the discharge guide cylinder (8) is provided with a discharge extension section (84) that exceeds the inner end of the discharge hollow shaft (22), and the length of the discharge extension section (84) is preferably 5-10 mm.